ciao a tutti
Provo a chiedere aiuto a voi
Da questa sera entrando nel pc, mi compare l'errore Generic host process for win 32; clicco su non inviare e dopo pochi minuti la schermata di Xp si trasforma in un Windows 98.
Provando una scansione col Nod32 a trovato questo Olamrik Trojan horse , solo che mi dice che è impossibile eliminarlo. Ho provato anche con Malawarebytes ma non trova nulla di infetto o sospetto

Questo è il log di Hijakthis
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 23.57.26, on 04/02/2011
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
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\Explorer.EXE
C:\Programmi\Google\Quick Search Box\GoogleQuickSearchBox.exe
C:\Programmi\ESET\ESET NOD32 Antivirus\egui.exe
C:\VEXPLite\MONLITE.EXE
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Google\GoogleToolbarNotifier\GoogleTo olbarNotifier.exe
C:\Programmi\Windows Live\Messenger\msnmsgr.exe
C:\Programmi\OpenOffice.org 3\program\soffice.exe
C:\Programmi\ESET\ESET NOD32 Antivirus\ekrn.exe
C:\Programmi\OpenOffice.org 3\program\soffice.bin
C:\WINDOWS\system32\libusbd-nt.exe
C:\Programmi\Microsoft\Search Enhancement Pack\SeaPort\SeaPort.exe
C:\VEXPLite\viritexp.exe
C:\WINDOWS\system32\svchost.exe
C:\VEXPLite\viritsvc.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Trend Micro\HijackThis\HijackThis.exe
C:\WINDOWS\system32\svchost.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
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
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O1 - Hosts: 64.235.52.100 www.italiamusic.org
O1 - Hosts: 64.235.52.100 www.italianshare.net
O1 - Hosts: 64.235.52.100 www.italiansexy.net
O1 - Hosts: 64.235.52.100 www.italiannetwork.net
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: Search Helper - {6EBF7485-159F-4bff-A14F-B9E3AAC4465B} - C:\Programmi\Microsoft\Search Enhancement Pack\Search Helper\SearchHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre1.6.0_07\bin\ssv.dll
O2 - BHO: Guida per l'accesso a Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Programmi\File comuni\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Easy Photo Print - {9421DD08-935F-4701-A9CA-22DF90AC4EA6} - C:\Programmi\Epson Software\Easy Photo Print\EPTBL.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - C:\Programmi\Google\Google Toolbar\GoogleToolbar_32.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Programmi\Google\GoogleToolbarNotifier\5.6.5612 .1312\swg.dll
O2 - BHO: Windows Live Toolbar Helper - {E15A8DC0-8516-42A1-81EA-DC94EC1ACF10} - C:\Programmi\Windows Live\Toolbar\wltcore.dll
O3 - Toolbar: Google Toolbar - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - C:\Programmi\Google\Google Toolbar\GoogleToolbar_32.dll
O3 - Toolbar: Easy Photo Print - {9421DD08-935F-4701-A9CA-22DF90AC4EA6} - C:\Programmi\Epson Software\Easy Photo Print\EPTBL.dll
O3 - Toolbar: &Windows Live Toolbar - {21FA44EF-376D-4D53-9B0F-8A89D3229068} - C:\Programmi\Windows Live\Toolbar\wltcore.dll
O4 - HKLM\..\Run: [Kernel and Hardware Abstraction Layer] KHALMNPR.EXE
O4 - HKLM\..\Run: [Google Quick Search Box] "C:\Programmi\Google\Quick Search Box\GoogleQuickSearchBox.exe" /autorun
O4 - HKLM\..\Run: [egui] "C:\Programmi\ESET\ESET NOD32 Antivirus\egui.exe" /hide /waitservice
O4 - HKLM\..\Run: [VIRIT LITE MONITOR] C:\VEXPLite\MONLITE.EXE
O4 - HKLM\..\RunOnce: [WIAWizardMenu] RUNDLL32.EXE C:\WINDOWS\system32\sti_ci.dll,WiaCreateWizardMenu
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [swg] "C:\Programmi\Google\GoogleToolbarNotifier\GoogleT oolbarNotifier.exe"
O4 - HKCU\..\Run: [msnmsgr] "C:\Programmi\Windows Live\Messenger\msnmsgr.exe" /background
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\RunOnce: [nlsf] cmd.exe /C move /Y "%SystemRoot%\System32\syssetub.dll" "%SystemRoot%\System32\syssetup.dll" (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - HKUS\.DEFAULT\..\RunOnce: [nlsf] cmd.exe /C move /Y "%SystemRoot%\System32\syssetub.dll" "%SystemRoot%\System32\syssetup.dll" (User 'Default user')
O4 - Startup: OpenOffice.org 3.0.lnk = C:\Programmi\OpenOffice.org 3\program\quickstart.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~1\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Google Sidewiki... - res://C:\Programmi\Google\Google Toolbar\Component\GoogleToolbarDynamic_mui_en_89D8 574934B26AC4.dll/cmsidewiki.html
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0_07\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0_07\bin\ssv.dll
O9 - Extra button: Inserisci blog - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Programmi\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: Inserisci &blog in Windows Live Writer - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Programmi\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~1\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/ge...nt/swflash.cab
O16 - DPF: {E2883E8F-472F-4FB0-9522-AC9BF37916A7} - http://platformdl.adobe.com/NOS/getPlusPlus/1.6/gp.cab
O23 - Service: ESET HTTP Server (EhttpSrv) - ESET - C:\Programmi\ESET\ESET NOD32 Antivirus\EHttpSrv.exe
O23 - Service: ESET Service (ekrn) - ESET - C:\Programmi\ESET\ESET NOD32 Antivirus\ekrn.exe
O23 - Service: Servizio di Google Update (gupdate) (gupdate) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Google Software Updater (gusvc) - Google - C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Logitech Bluetooth Service (LBTServ) - Logitech, Inc. - C:\Programmi\File comuni\Logishrd\Bluetooth\LBTServ.exe
O23 - Service: LibUsb-Win32 - Daemon, Version 0.1.10.1 (libusbd) - http://libusb-win32.sourceforge.net - C:\WINDOWS\system32\libusbd-nt.exe
O23 - Service: VirIT eXplorer Lite (viritsvclite) - TG Soft Sas www.tgsoft.it - C:\VEXPLite\viritsvc.exe

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End of file - 7477 bytes
Spero in un vostro aiuto
Grazie in anticipo