sp3

NET Framework 2 service pack 2
NET Framework 2 service pack 2
NET Framework 3.5 sp1
NET Framework 4 client profile
NET Framework 4 client profile language pack ita

che sia il caso di disinstallarli tutti e di reinstallare il 4?

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 22.55.34, on 07/02/2012
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP3 (6.00.2900.5512)
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\svchost.exe
C:\Programmi\HitmanPro\hmpsched.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Avira\AntiVir Desktop\sched.exe
C:\Programmi\Avira\AntiVir Desktop\avguard.exe
C:\Programmi\TOSHIBA\ConfigFree\CFSvcs.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\Malwarebytes' Anti-Malware\mbamservice.exe
C:\Programmi\File comuni\Microsoft Shared\VS7Debug\mdm.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Avira\AntiVir Desktop\avshadow.exe
C:\Programmi\Avira\AntiVir Desktop\avmailc.exe
C:\Programmi\Avira\AntiVir Desktop\AVWEBGRD.EXE
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\Programmi\Synaptics\SynTP\SynTPLpr.exe
C:\Programmi\Synaptics\SynTP\SynTPEnh.exe
C:\Programmi\TOSHIBA\ConfigFree\NDSTray.exe
C:\Programmi\Avira\AntiVir Desktop\avgnt.exe
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Mozilla Firefox\plugin-container.exe
C:\Programmi\Trend Micro\HiJackThis\HiJackThis.exe

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 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre6\bin\ssv.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O4 - HKLM\..\Run: [SynTPLpr] C:\Programmi\Synaptics\SynTP\SynTPLpr.exe
O4 - HKLM\..\Run: [SynTPEnh] C:\Programmi\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [NDSTray.exe] NDSTray.exe
O4 - HKLM\..\Run: [avgnt] "C:\Programmi\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [Malwarebytes' Anti-Malware] "C:\Programmi\Malwarebytes' Anti-Malware\mbamgui.exe" /starttray
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
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')
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\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
O17 - HKLM\System\CCS\Services\Tcpip\..\{23398F0D-BD65-4140-892B-112AB15BDA1F}: NameServer = 8.8.8.8,8.8.4.4
O17 - HKLM\System\CCS\Services\Tcpip\..\{3AED95C1-8A07-43D4-BC9F-29AA8A7D6D04}: NameServer = 8.8.8.8,8.8.4.4
O22 - SharedTaskScheduler: Precaricatore Browseui - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - C:\WINDOWS\system32\browseui.dll
O22 - SharedTaskScheduler: Daemon di cache delle categorie di componenti - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\WINDOWS\system32\browseui.dll
O23 - Service: Avira Mail Protection (AntiVirMailService) - Avira Operations GmbH & Co. KG - C:\Programmi\Avira\AntiVir Desktop\avmailc.exe
O23 - Service: Avira Scheduler (AntiVirSchedulerService) - Avira Operations GmbH & Co. KG - C:\Programmi\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira Realtime Protection (AntiVirService) - Avira Operations GmbH & Co. KG - C:\Programmi\Avira\AntiVir Desktop\avguard.exe
O23 - Service: Avira Web Protection (AntiVirWebService) - Avira Operations GmbH & Co. KG - C:\Programmi\Avira\AntiVir Desktop\AVWEBGRD.EXE
O23 - Service: ConfigFree Service (CFSvcs) - TOSHIBA CORPORATION - C:\Programmi\TOSHIBA\ConfigFree\CFSvcs.exe
O23 - Service: HitmanPro Scheduler (HitmanProScheduler) - SurfRight B.V. - C:\Programmi\HitmanPro\hmpsched.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: MBAMService - Malwarebytes Corporation - C:\Programmi\Malwarebytes' Anti-Malware\mbamservice.exe
O23 - Service: ServiceLayer - Nokia. - C:\Programmi\File comuni\PCSuite\Services\ServiceLayer.exe

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End of file - 5600 bytes

Ciao vera, scusa ma mi era sfuggito il tuo log, il log è pulito.
Il problema permane ?
Prova QUESTO programma, riesce e risolvere molti
problemi di XP, speriamo bene.