[Resolvido!] Não consigo instalar antivirus no PC

Olá!

Estou com problemas no PC desde o mês de novembro de 2009.

Mas, o Avast estava dando conta.

Até que o avast se tornou inoperante. Então resolvi desinstala-lo.

O desinstalei mas quando fui reinstalar não consegui.

Tentei desde então instalar outros antivirus mas até então não consegui instalar nenhum.

Nem bem abre a tela de instalação ela já some automaticamente.

Lendo outros tópicos deste site baixei o HijackThis. Olhe o log que ele me deu:

Logfile of Trend Micro HijackThis v2.0.2

Scan saved at 13:27:32, on 5/2/2010

Platform: Windows XP SP2 (WinNT 5.01.2600)

MSIE: Internet Explorer v7.00 (7.00.5730.0013)

Boot mode: Normal

Running processes:

C:\WINDOWS\System32\smss.exe

C:\WINDOWS\system32\winlogon.exe

C:\WINDOWS\system32\services.exe

C:\WINDOWS\system32\lsass.exe

C:\WINDOWS\system32\svchost.exe

C:\WINDOWS\System32\svchost.exe

C:\WINDOWS\system32\LEXBCES.EXE

C:\WINDOWS\system32\spoolsv.exe

C:\WINDOWS\system32\LEXPPS.EXE

C:\WINDOWS\system32\cisvc.exe

C:\WINDOWS\system32\svchost.exe

C:\WINDOWS\System32\svchost.exe

C:\WINDOWS\System32\svchost.exe

C:\Arquivos de programas\Microsoft\Search Enhancement Pack\SeaPort\SeaPort.exe

C:\WINDOWS\system32\svchost.exe

C:\WINDOWS\system32\EXPLORER.EXE

C:\WINDOWS\Explorer.EXE

C:\WINDOWS\system32\VTTimer.exe

C:\WINDOWS\system32\XP-596D7BEF.EXE

C:\Arquivos de programas\HP\HP Software Update\HPWuSchd2.exe

C:\Arquivos de programas\HP\Digital Imaging\bin\hpqSRMon.exe

C:\WINDOWS\system32\ctfmon.exe

C:\WINDOWS\system32\cidaemon.exe

C:\Arquivos de programas\HP\Digital Imaging\Smart Web Printing\hpswp_clipbook.exe

C:\Arquivos de programas\Internet Explorer\iexplore.exe

C:\WINDOWS\system32\NEV09606.EXE

C:\DOCUME~1\Diogo\CONFIG~1\Temp\winwtdpc.exe

C:\Documents and Settings\Diogo\Desktop\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = &http://home.microsoft.com/intl/br/access/allinone.asp

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157

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://go.microsoft.com/fwlink/?LinkId=69157

F2 - REG:system.ini: UserInit=userinit.exe,EXPLORER.EXE

O2 - BHO: HP Print Enhancer - {0347C33E-8762-4905-BF09-768834316C61} - C:\Arquivos de programas\HP\Digital Imaging\Smart Web Printing\hpswp_printenhancer.dll

O2 - BHO: Facilitador de Leitor de Link Adobe PDF - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Arquivos de programas\Arquivos comuns\Adobe\Acrobat\ActiveX\AcroIEHelper.dll

O2 - BHO: Search Helper - {6EBF7485-159F-4bff-A14F-B9E3AAC4465B} - C:\Arquivos de programas\Microsoft\Search Enhancement Pack\Search Helper\SearchHelper.dll

O2 - BHO: HP Smart BHO Class - {FFFFFFFF-CF4E-4F2B-BDC2-0E72E116A856} - C:\Arquivos de programas\HP\Digital Imaging\Smart Web Printing\hpswp_BHO.dll

O4 - HKLM\..\Run: [PrinTray] C:\WINDOWS\System32\spool\DRIVERS\W32X86\2\printray.exe

O4 - HKLM\..\Run: [Mirabilis ICQ] C:\Arquivos de programas\ICQ\NDetect.exe

O4 - HKLM\..\Run: [VTTimer] VTTimer.exe

O4 - HKLM\..\Run: [VTTrayp] VTtrayp.exe

O4 - HKLM\..\Run: [barsaka] explorer.exe

O4 - HKLM\..\Run: [avast!] C:\ARQUIV~1\ALWILS~1\Avast4\ashDisp.exe

O4 - HKLM\..\Run: [XP-596D7BEF] C:\WINDOWS\system32\XP-596D7BEF.EXE

O4 - HKLM\..\Run: [HP Software Update] C:\Arquivos de programas\HP\HP Software Update\HPWuSchd2.exe

O4 - HKLM\..\Run: [hpqSRMon] C:\Arquivos de programas\HP\Digital Imaging\bin\hpqSRMon.exe

O4 - HKLM\..\Run: [Runonce] C:\WINDOWS\system32\runouce.exe

O4 - HKLM\..\Run: [MSConfig] C:\WINDOWS\pchealth\helpctr\binaries\msconfig.exe /auto

O4 - HKCU\..\Run: [bgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Arquivos de programas\Arquivos comuns\Ahead\Lib\NMBgMonitor.exe"

O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe

O4 - HKCU\..\Run: [spybotSD TeaTimer] C:\Arquivos de programas\Spybot - Search & Destroy\TeaTimer.exe

O4 - HKCU\..\Run: [PhotoShow Deluxe Media Manager] C:\ARQUIV~1\Nero\data\Xtras\mssysmgr.exe

O4 - HKCU\..\Run: [wsctf.exe] wsctf.exe

O4 - HKCU\..\Run: [EXPLORER.EXE] EXPLORER.EXE

O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'LOCAL SERVICE')

O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'NETWORK SERVICE')

O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')

O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')

O4 - Startup: ¡¡¡¡¡¡.lnk = C:\WINDOWS\system32\XP-596D7BEF.EXE

O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Arquivos de programas\Adobe\Reader 8.0\Reader\reader_sl.exe

O4 - Global Startup: Adobe Reader Synchronizer.lnk = C:\Arquivos de programas\Adobe\Reader 8.0\Reader\AdobeCollabSync.exe

O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Arquivos de programas\HP\Digital Imaging\bin\hpqtra08.exe

O4 - Global Startup: Microsoft Office.lnk = C:\Arquivos de programas\Microsoft Office\Office\OSA9.EXE

O7 - HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System, DisableRegedit=1

O9 - Extra button: (no name) - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - (no file)

O9 - Extra button: Seleção HP Smart - {DDE87865-83C5-48c4-8357-2F5B1AA84522} - C:\Arquivos de programas\HP\Digital Imaging\Smart Web Printing\hpswp_BHO.dll

O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Arquivos de programas\Messenger\msmsgs.exe (file missing)

O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Arquivos de programas\Messenger\msmsgs.exe (file missing)

O14 - IERESET.INF: SEARCH_PAGE_URL=&http://home.microsoft.com/intl/br/access/allinone.asp

O16 - DPF: {2ADE19BB-1E79-4EC4-976E-AC74339ADD76} (ActiveViewGUI Control) - http://www.concursofec.uff.br/ActiveViewGUI.cab

O16 - DPF: {5D6F45B3-9043-443D-A792-115447494D24} (UnoCtrl Class) - http://messenger.zone.msn.com/PT-BR/a-UNO1/GAME_UNO1.cab

O16 - DPF: {66F7F252-3FE1-4650-B1E5-94B2A38271C5} (ActiveView Control) - http://www.concursofec.uff.br/ActiveView.cab

O16 - DPF: {F5A7706B-B9C0-4C89-A715-7A0C6B05DD48} (Minesweeper Flags Class) - http://messenger.zone.msn.com/binary/MineSweeper.cab56986.cab

O17 - HKLM\System\CCS\Services\Tcpip\..\{358B3EF6-71CF-4F94-AA73-06446E13D362}: NameServer = 200.222.0.34 200.202.193.75

O23 - Service: ASP.NET State Service (aspnet_state) - Unknown owner - C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_state.exe (file missing)

O23 - Service: LexBce Server (LexBceS) - Lexmark International, Inc. - C:\WINDOWS\system32\LEXBCES.EXE

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End of file - 6390 bytes

Preciso de ajuda.

Aguardo resposta.