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Puedes darle una hojeada a este log :

Logfile of HijackThis v1.98.2

Scan saved at 15:11:54, on 13-09-2004

Platform: Windows XP SP1 (WinNT 5.01.2600)

MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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\Explorer.EXE

C:\Documents and Settings\fullnet\Mis documentos\Downloads\hijackthis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page =

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =

R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =

O2 - BHO: Yahoo! Companion BHO - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\Archivos de programa\Yahoo!\Messenger\ycomp.dll

O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Archivos de programa\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx

O2 - BHO: - {35781E54-A465-4638-90F5-26702F011BC3} - C:\WINDOWS\lbbho.dll

O2 - BHO: (no name) - {3EF2612D-973C-78C1-8725-105509D2263B} - C:\WINDOWS\System32\npofqezi.dll

O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\ARCHIV~1\SPYBOT~1\SDHelper.dll

O2 - BHO: (no name) - {9394EDE7-C8B5-483E-8773-474BF36AF6E4} - (no file)

O2 - BHO: (no name) - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - (no file)

O2 - BHO: CNavExtBho Class - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Archivos de programa\Norton AntiVirus\NavShExt.dll

O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Archivos de programa\Norton AntiVirus\NavShExt.dll

O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx

O4 - HKLM\..\Run: [SiS Windows KeyHook] C:\WINDOWS\System32\keyhook.exe

O4 - HKLM\..\Run: [Cmaudio] RunDll32 cmicnfg.cpl,CMICtrlWnd

O4 - HKLM\..\Run: [ccApp] "C:\Archivos de programa\Archivos comunes\Symantec Shared\ccApp.exe"

O4 - HKLM\..\Run: [ccRegVfy] "C:\Archivos de programa\Archivos comunes\Symantec Shared\ccRegVfy.exe"

O4 - HKLM\..\Run: [Microsoft Update Machine] Winregs32.exe

O4 - HKLM\..\Run: [ATI VIDEO REGKEY] ati2vid.exe

O4 - HKLM\..\Run: [Win32 USB2 Driver] svchosting.exe

O4 - HKLM\..\Run: [Microsoft Update] mvsc.exe

O4 - HKLM\..\Run: [Microsoft Update Debugger] wincfg32.exe

O4 - HKLM\..\Run: [Video Process] jkaiapq.exe

O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Archivos de programa\Java\j2re1.4.2_05\bin\jusched.exe

O4 - HKLM\..\Run: [Windows Service Pack2] svchhost.exe

O4 - HKLM\..\Run: [MessengerPlus3] "C:\Archivos de programa\Messenger Plus! 3\MsgPlus.exe"

O4 - HKLM\..\Run: [Services] C:\windows\system32\boon.exe

O4 - HKLM\..\Run: [QuickTime Task] "C:\Archivos de programa\QuickTime\qttask.exe" -atboottime

O4 - HKLM\..\Run: [msnappau] "C:\Archivos de programa\MSN Apps\Updater\01.02.0002.1001\es-la\msnappau.exe"

O4 - HKLM\..\Run: [$WindowsRegKey%update] IEXPLORE.EXE

O4 - HKLM\..\Run: [Windows Taskbar Manager] c:\windows\xinet.exe

O4 - HKLM\..\Run: [Quicktime Mediaplayr] wnmplyr.exe

O4 - HKLM\..\Run: [SiSUSBRG] C:\WINDOWS\SiSUSBrg.exe

O4 - HKLM\..\Run: [msnmsgr32-.exe] msnmsgr-.exe

O4 - HKLM\..\Run: [sex service] winsysengine.exe

O4 - HKLM\..\RunServices: [Microsoft Update Machine] Winregs32.exe

O4 - HKLM\..\RunServices: [ATI VIDEO REGKEY] ati2vid.exe

O4 - HKLM\..\RunServices: [$WindowsRegKey%update] IEXPLORE.EXE

O4 - HKLM\..\RunServices: [Win32 USB2 Driver] svchosting.exe

O4 - HKLM\..\RunServices: [Microsoft Update] mvsc.exe

O4 - HKLM\..\RunServices: [Microsoft Update Debugger] wincfg32.exe

O4 - HKLM\..\RunServices: [Video Process] jkaiapq.exe

O4 - HKLM\..\RunServices: [Windows Service Pack2] svchhost.exe

O4 - HKLM\..\RunServices: [Quicktime Mediaplayr] wnmplyr.exe

O4 - HKLM\..\RunServices: [msnmsgr32-.exe] msnmsgr-.exe

O4 - HKLM\..\RunServices: [sex service] winsysengine.exe

O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE

O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - (no file)

O9 - Extra 'Tools' menuitem: Consola de Sun Java - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - (no file)

O9 - Extra button: Yahoo! Messenger - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96} - C:\ARCHIV~1\YAHOO!\MESSEN~1\YPAGER.EXE

O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96} - C:\ARCHIV~1\YAHOO!\MESSEN~1\YPAGER.EXE

O12 - Plugin for .spop: C:\Archivos de programa\Internet Explorer\Plugins\NPDocBox.dll

O16 - DPF: {2BC66F54-93A8-11D3-BEB6-00105AA9B6AE} (Symantec AntiVirus scanner) - http://security.symantec.com/sscv6/SharedContent/vc/bin/AvSniff.cab

O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab

O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://www.pandasoftware.com/activescan/as5/asinst.cab

Muchas gracias

Caito

Entre tanta basura es dificil ver bien pero haz lo siguiente:

Panel control >> agregar remover programas >> desisntala el Windows XP Related

Si has usado el hijackThis anteriormente dale a config >> Backups >> elimina todos los backups.

Entra al sistema en modo seguro y limpia estas:

O2 - BHO: - {35781E54-A465-4638-90F5-26702F011BC3} - C:\WINDOWS\lbbho.dll

O2 - BHO: (no name) - {3EF2612D-973C-78C1-8725-105509D2263B} - C:\WINDOWS\System32\npofqezi.dll

O4 - HKLM\..\Run: [Microsoft Update Machine] Winregs32.exe

O4 - HKLM\..\Run: [ATI VIDEO REGKEY] ati2vid.exe

O4 - HKLM\..\Run: [Win32 USB2 Driver] svchosting.exe

O4 - HKLM\..\Run: [Microsoft Update] mvsc.exe

O4 - HKLM\..\Run: [Microsoft Update Debugger] wincfg32.exe

O4 - HKLM\..\Run: [Video Process] jkaiapq.exe

O4 - HKLM\..\Run: [Windows Service Pack2] svchhost.exe

O4 - HKLM\..\Run: [Services] C:\windows\system32\boon.exe

O4 - HKLM\..\Run: [$WindowsRegKey%update] IEXPLORE.EXE

O4 - HKLM\..\Run: [Windows Taskbar Manager] c:\windows\xinet.exe

O4 - HKLM\..\Run: [Quicktime Mediaplayr] wnmplyr.exe

O4 - HKLM\..\Run: [msnmsgr32-.exe] msnmsgr-.exe

O4 - HKLM\..\Run: [sex service] winsysengine.exe

O4 - HKLM\..\RunServices: [Microsoft Update Machine] Winregs32.exe

O4 - HKLM\..\RunServices: [ATI VIDEO REGKEY] ati2vid.exe

O4 - HKLM\..\RunServices: [$WindowsRegKey%update] IEXPLORE.EXE

O4 - HKLM\..\RunServices: [Win32 USB2 Driver] svchosting.exe

O4 - HKLM\..\RunServices: [Microsoft Update] mvsc.exe

O4 - HKLM\..\RunServices: [Microsoft Update Debugger] wincfg32.exe

O4 - HKLM\..\RunServices: [Video Process] jkaiapq.exe

O4 - HKLM\..\RunServices: [Windows Service Pack2] svchhost.exe

O4 - HKLM\..\RunServices: [Quicktime Mediaplayr] wnmplyr.exe

O4 - HKLM\..\RunServices: [msnmsgr32-.exe] msnmsgr-.exe

O4 - HKLM\..\RunServices: [sex service] winsysengine.exe

O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - (no file)

Despuésreinicia normalmente y postea otro log.