[Resolvido] &nbspPC muito lento, alertas de antivirus, mudança de home

Olá pessoal, boa tarde.

Estou com um problema no meu pc desde que minha irmã instalou o programa "Megacubo". Ele alterou a home page de todos meu navegadores, e também editou o atalho para abrir a pagina "Portal dos Sites" ¬¬.
Depois disso instalei o malware bytes e ele sempre acusa infecção, move pra quarentena uma porção de coisa.

Tem um autorun (bloqueado pelo avira) no pen drive que não sai mesmo depois de formatado.

Ta todo zuado esse pc!
Gostaria que vcs analizassem o log abaixo para verificar alguma possível solução.

Agradeço desde já.

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 17:19:18, on 07/05/2013
Platform: Windows 7 (WinNT 6.00.3504)
MSIE: Internet Explorer v9.00 (9.00.8112.16476)
Boot mode: Normal

Running processes:
C:\Program Files (x86)\Malwarebytes' Anti-Malware\mbamgui.exe
C:\Users\FELIPE\AppData\Roaming\Dropbox\bin\Dropbox.exe
C:\Program Files (x86)\Avira\AntiVir Desktop\avgnt.exe
C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Adobe\Reader 10.0\Reader\AcroRd32.exe
C:\Program Files (x86)\Adobe\Reader 10.0\Reader\AcroRd32.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Users\FELIPE\Desktop\Hijackthis\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.qvo6.com/?utm_source=b&utm_medium=newgdp&from=newgdp&uid=ST9500420AS_5VJAM32HXXXX5VJAM32H&ts=1367842805

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.qvo6.com/?utm_source=b&utm_medium=newgdp&from=newgdp&uid=ST9500420AS_5VJAM32HXXXX5VJAM32H&ts=1367842805

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.qvo6.com/?utm_source=b&utm_medium=newgdp&from=newgdp&uid=ST9500420AS_5VJAM32HXXXX5VJAM32H&ts=1367842805

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896

R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.qvo6.com/?utm_source=b&utm_medium=newgdp&from=newgdp&uid=ST9500420AS_5VJAM32HXXXX5VJAM32H&ts=1367842805

R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\Windows\SysWOW64\blank.htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: uTorrentBar_PT Toolbar - {e0301295-ab3e-4af3-979f-3d453c5f9f48} - C:\Program Files (x86)\uTorrentBar_PT\prxtbuTor.dll
F2 - REG:system.ini: UserInit=userinit.exe
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files (x86)\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: Lync Click to Call BHO - {31D09BA0-12F5-4CCE-BE8A-2923E76605DA} - C:\Program Files (x86)\Microsoft Office\Office15\OCHelper.dll
O2 - BHO: Groove GFS Browser Helper - {72853161-30C5-4D22-B7F9-0BBC1D38A37E} - C:\PROGRA~2\MICROS~2\Office14\GROOVEEX.DLL
O2 - BHO: Java Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files (x86)\Java\jre7\bin\ssv.dll
O2 - BHO: Auxiliar de Conexão de Conta da Microsoft - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: URLRedirectionBHO - {B4F3A835-0E21-4959-BA22-42B3008E02FF} - C:\PROGRA~2\MICROS~2\Office15\URLREDIR.DLL
O2 - BHO: SpoofStick BHO - {CBA74CDA-DF78-4AD9-954E-3B15D0A993DE} - C:\Program Files (x86)\CoreStreet\SpoofStick\SpoofStickBHO.dll
O2 - BHO: Microsoft SkyDrive Pro Browser Helper - {D0498E0A-45B7-42AE-A9AA-ABA463DBD3BF} - C:\PROGRA~2\MICROS~2\Office15\GROOVEEX.DLL
O2 - BHO: Java Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files (x86)\Java\jre7\bin\jp2ssv.dll
O2 - BHO: uTorrentBar_PT - {e0301295-ab3e-4af3-979f-3d453c5f9f48} - C:\Program Files (x86)\uTorrentBar_PT\prxtbuTor.dll
O3 - Toolbar: SpoofStick - {4D46ED77-1429-4CF6-8F63-C84B5D710BAF} - C:\Program Files (x86)\CoreStreet\SpoofStick\SpoofStick.dll
O3 - Toolbar: uTorrentBar_PT Toolbar - {e0301295-ab3e-4af3-979f-3d453c5f9f48} - C:\Program Files (x86)\uTorrentBar_PT\prxtbuTor.dll
O4 - HKLM\..\Run: [avgnt] "C:\Program Files (x86)\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [sunJavaUpdateSched] "C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe"
O4 - HKCU\..\Run: [uTorrent] "C:\Program Files (x86)\uTorrent\uTorrent.exe" /MINIMIZED
O4 - HKCU\..\Run: [Megacubo] "C:\Program Files (x86)\Megacubo\megacubo.exe" -load:update -type:startup
O4 - HKUS\S-1-5-19\..\Run: [sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVIÇO LOCAL')
O4 - HKUS\S-1-5-19\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVIÇO LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVIÇO DE REDE')
O4 - HKUS\S-1-5-20\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVIÇO DE REDE')
O4 - Startup: Dropbox.lnk = FELIPE\AppData\Roaming\Dropbox\bin\Dropbox.exe
O4 - Global Startup: Bluetooth.lnk = ?
O8 - Extra context menu item: &Enviar para o OneNote - res://C:\PROGRA~1\MICROS~2\Office15\ONBttnIE.dll/105
O8 - Extra context menu item: E&xportar para o Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office15\EXCEL.EXE/3000
O8 - Extra context menu item: Enviar imagem para Dispositivo &Bluetooth... - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie_ctx.htm
O8 - Extra context menu item: Enviar página para Dispositivo &Bluetooth ... - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie.htm
O9 - Extra button: @C:\Program Files (x86)\Windows Live\Writer\WindowsLiveWriterShortcuts.dll,-1004 - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files (x86)\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: @C:\Program Files (x86)\Windows Live\Writer\WindowsLiveWriterShortcuts.dll,-1003 - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files (x86)\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra button: Enviar para o OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\Program Files (x86)\Microsoft Office\Office15\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: &Enviar para o OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\Program Files (x86)\Microsoft Office\Office15\ONBttnIE.dll
O9 - Extra button: Clique para Telefonar do Lync - {31D09BA0-12F5-4CCE-BE8A-2923E76605DA} - C:\Program Files (x86)\Microsoft Office\Office15\OCHelper.dll
O9 - Extra 'Tools' menuitem: Clique para Telefonar do Lync - {31D09BA0-12F5-4CCE-BE8A-2923E76605DA} - C:\Program Files (x86)\Microsoft Office\Office15\OCHelper.dll
O9 - Extra button: &Anotações Vinculadas do OneNote - {789FE86F-6FC4-46A1-9849-EDE0DB0C95CA} - C:\Program Files (x86)\Microsoft Office\Office15\ONBttnIELinkedNotes.dll
O9 - Extra 'Tools' menuitem: &Anotações Vinculadas do OneNote - {789FE86F-6FC4-46A1-9849-EDE0DB0C95CA} - C:\Program Files (x86)\Microsoft Office\Office15\ONBttnIELinkedNotes.dll
O9 - Extra button: Enviar para Bluetooth - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie.htm
O9 - Extra 'Tools' menuitem: Enviar para Dispositivo &Bluetooth... - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie.htm
O10 - Unknown file in Winsock LSP: c:\program files (x86)\common files\microsoft shared\windows live\wlidnsp.dll
O10 - Unknown file in Winsock LSP: c:\program files (x86)\common files\microsoft shared\windows live\wlidnsp.dll
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O18 - Protocol: osf - {D924BDC6-C83A-4BD5-90D0-095128A113D1} - C:\Program Files (x86)\Microsoft Office\Office15\MSOSB.DLL
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~2\COMMON~1\Skype\SKYPE4~1.DLL
O18 - Filter hijack: text/xml - {807583E5-5146-11D5-A672-00B0D022E945} - C:\Program Files (x86)\Common Files\Microsoft Shared\OFFICE15\MSOXMLMF.DLL

O23 - Service: Adobe Acrobat Update Service (AdobeARMservice) - Adobe Systems Incorporated - C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\armsvc.exe
O23 - Service: Adobe Flash Player Update Service (AdobeFlashPlayerUpdateSvc) - Adobe Systems Incorporated - C:\Windows\SysWOW64\Macromed\Flash\FlashPlayerUpdateService.exe

O23 - Service: Andrea ST Filters Service (AESTFilters) - Andrea Electronics Corporation - C:\Windows\System32\DriverStore\FileRepository\stwrt64.inf_amd64_neutral_d550fa1f2cf8996d\AESTSr64.exe
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing)
O23 - Service: Avira Agendamento (AntiVirSchedulerService) - Avira Operations GmbH & Co. KG - C:\Program Files (x86)\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira Real-Time Protection (AntiVirService) - Avira Operations GmbH & Co. KG - C:\Program Files (x86)\Avira\AntiVir Desktop\avguard.exe
O23 - Service: Bluetooth Service (btwdins) - Broadcom Corporation. - C:\Program Files\WIDCOMM\Bluetooth Software\btwdins.exe
O23 - Service: Dell Digital Delivery Service (DellDigitalDelivery) - Dell Products, LP. - C:\Program Files (x86)\Dell Digital Delivery\DeliveryService.exe
O23 - Service: @C:\Program Files\DigitalPersona\Bin\DpHostW.exe,-128 (DpHost) - DigitalPersona, Inc. - C:\Program Files\DigitalPersona\Bin\DpHostW.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\Windows\System32\lsass.exe (file missing)
O23 - Service: eSafe Service (eSafeSvc) - eSafe Security Co., Ltd. - C:\ProgramData\eSafe\eGdpSvc.exe
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\Windows\system32\fxssvc.exe (file missing)

O23 - Service: Serviço do Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: Serviço do Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe

O23 - Service: Altera JTAG Server (JTAGServer) - Unknown owner - c:\altera\11.1sp2\quartus\bin64\jtagserver.exe
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: KMService - Unknown owner - C:\Windows\system32\srvany.exe
O23 - Service: KMS Server Service (KMSServerService) - Unknown owner - C:\Windows\KMSServerService\KMS Server Service.exe
O23 - Service: Intel® Management and Security Application Local Management Service (LMS) - Intel Corporation - C:\Program Files (x86)\Intel\Intel® Management Engine Components\LMS\LMS.exe
O23 - Service: MBAMScheduler - Malwarebytes Corporation - C:\Program Files (x86)\Malwarebytes' Anti-Malware\mbamscheduler.exe
O23 - Service: MBAMService - Malwarebytes Corporation - C:\Program Files (x86)\Malwarebytes' Anti-Malware\mbamservice.exe
O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - C:\Program Files (x86)\Mozilla Maintenance Service\maintenanceservice.exe
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\Windows\System32\msdtc.exe (file missing)
O23 - Service: @C:\Program Files (x86)\Nero\Update\NASvc.exe,-200 (NAUpdate) - Nero AG - C:\Program Files (x86)\Nero\Update\NASvc.exe
O23 - Service: @%SystemRoot%\System32\netlogon.dll,-102 (Netlogon) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: NVIDIA Display Driver Service (nvsvc) - Unknown owner - C:\Windows\system32\nvvsvc.exe (file missing)
O23 - Service: @%systemroot%\system32\psbase.dll,-300 (ProtectedStorage) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: Qtype Service (QtypeSvc) - 337 Technology Limited. - C:\Program Files (x86)\QType\QtypeSvc.exe
O23 - Service: @%systemroot%\system32\Locator.exe,-2 (RpcLocator) - Unknown owner - C:\Windows\system32\locator.exe (file missing)
O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: Skype Updater (SkypeUpdate) - Skype Technologies - C:\Program Files (x86)\Skype\Updater\Updater.exe
O23 - Service: @%SystemRoot%\system32\snmptrap.exe,-3 (SNMPTRAP) - Unknown owner - C:\Windows\System32\snmptrap.exe (file missing)
O23 - Service: @%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - C:\Windows\System32\spoolsv.exe (file missing)
O23 - Service: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - C:\Windows\system32\sppsvc.exe (file missing)
O23 - Service: Audio Service (STacSV) - IDT, Inc. - C:\Windows\System32\DriverStore\FileRepository\stwrt64.inf_amd64_neutral_d550fa1f2cf8996d\STacSV64.exe
O23 - Service: TeamViewer 8 (TeamViewer8) - TeamViewer GmbH - C:\Program Files (x86)\TeamViewer\Version8\TeamViewer_Service.exe
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\Windows\system32\UI0Detect.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vaultsvc.dll,-1003 (VaultSvc) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: Validity VCS Fingerprint Service (vcsFPService) - Validity Sensors, Inc. - C:\Windows\system32\vcsFPService.exe
O23 - Service: @%SystemRoot%\system32\vds.exe,-100 (vds) - Unknown owner - C:\Windows\System32\vds.exe (file missing)
O23 - Service: @%systemroot%\system32\vssvc.exe,-102 (VSS) - Unknown owner - C:\Windows\system32\vssvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\Wat\WatUX.exe,-601 (WatAdminSvc) - Unknown owner - C:\Windows\system32\Wat\WatAdminSvc.exe (file missing)
O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - C:\Windows\system32\wbengine.exe (file missing)
O23 - Service: DW WLAN Tray Service (wltrysvc) - Dell Inc. - C:\Program Files\Dell\DW WLAN Card\WLTRYSVC.EXE
O23 - Service: Mobile Broadband Core Service (WMCoreService) - Unknown owner - C:\Program Files (x86)\Dell\Dell WWAN\WMCore\mini_WMCore.exe
O23 - Service: @%Systemroot%\system32\wbem\wmiapsrv.exe,-110 (wmiApSrv) - Unknown owner - C:\Windows\system32\wbem\WmiApSrv.exe (file missing)
O23 - Service: @%PROGRAMFILES%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - C:\Program Files (x86)\Windows Media Player\wmpnetwk.exe (file missing)

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