intanto grazie mille per la risposta, ecco il risultato di hjackthis:
Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 10.48.57, on 28/07/2012
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
Boot mode: Normal
Running processes:
H:\WINDOWS\System32\smss.exe
H:\WINDOWS\system32\winlogon.exe
H:\WINDOWS\system32\services.exe
H:\WINDOWS\system32\lsass.exe
H:\WINDOWS\system32\nvsvc32.exe
H:\WINDOWS\system32\svchost.exe
H:\WINDOWS\System32\svchost.exe
H:\WINDOWS\system32\spoolsv.exe
H:\Programmi\Kaspersky Lab\Kaspersky Internet Security 2011\avp.exe
H:\Programmi\Java\jre6\bin\jqs.exe
H:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\MDM.EXE
H:\WINDOWS\system32\svchost.exe
H:\WINDOWS\Explorer.EXE
H:\WINDOWS\ALCXMNTR.EXE
H:\WINDOWS\system32\RUNDLL32.EXE
H:\Programmi\Kaspersky Lab\Kaspersky Internet Security 2011\avp.exe
H:\Programmi\File comuni\Java\Java Update\jusched.exe
H:\WINDOWS\system32\ctfmon.exe
H:\Programmi\Messenger\msmsgs.exe
H:\Programmi\Mozilla Firefox\firefox.exe
H:\Programmi\Mozilla Firefox\plugin-container.exe
H:\Documents and Settings\PC\Desktop\Programmi\HijackThis\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://search.findeer.com/
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
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = localhost:8118
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - H:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: IEVkbdBHO - {59273AB4-E7D3-40F9-A1A8-6FA9CCA1862C} - H:\Programmi\Kaspersky Lab\Kaspersky Internet Security 2011\ievkbd.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: Java Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - H:\Programmi\Java\jre6\bin\ssv.dll
O2 - BHO: Guida per l'accesso a Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - H:\Programmi\File comuni\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Java Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - H:\Programmi\Java\jre6\bin\jp2ssv.dll
O2 - BHO: link filter bho - {E33CF602-D945-461A-83F0-819F76A199F8} - H:\Programmi\Kaspersky Lab\Kaspersky Internet Security 2011\klwtbbho.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - H:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O4 - HKLM\..\Run: [AlcxMonitor] ALCXMNTR.EXE
O4 - HKLM\..\Run: [nwiz] H:\Programmi\NVIDIA Corporation\nView\nwiz.exe /installquiet
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE H:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE H:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [PCSuiteTrayApplication] H:\PROGRA~1\Nokia\NOKIAP~1\LAUNCH~1.EXE -startup
O4 - HKLM\..\Run: [NeroFilterCheck] H:\Programmi\File comuni\Nero\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "H:\Programmi\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [Adobe ARM] "H:\Programmi\File comuni\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [AVP] "H:\Programmi\Kaspersky Lab\Kaspersky Internet Security 2011\avp.exe"
O4 - HKLM\..\Run: [sunJavaUpdateSched] "H:\Programmi\File comuni\Java\Java Update\jusched.exe"
O4 - HKCU\..\Run: [ctfmon.exe] H:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "H:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] H:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] H:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O8 - Extra context menu item: Aggiungi ad Anti-Banner - H:\Programmi\Kaspersky Lab\Kaspersky Internet Security 2011\ie_banner_deny.htm
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://H:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: &Tastiera Virtuale - {4248FE82-7FCB-46AC-B270-339F08212110} - H:\Programmi\Kaspersky Lab\Kaspersky Internet Security 2011\klwtbbho.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - H:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: C&ontrollo URL - {CCF151D8-D089-449F-A5A4-D9909053F20F} - H:\Programmi\Kaspersky Lab\Kaspersky Internet Security 2011\klwtbbho.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - H:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - H:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - H:\Programmi\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - H:\Programmi\Messenger\msmsgs.exe
O20 - AppInit_DLLs: H:\PROGRA~1\KASPER~1\KASPER~1\kloehk.dll
O22 - SharedTaskScheduler: Precaricatore Browseui - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - H:\WINDOWS\system32\browseui.dll
O22 - SharedTaskScheduler: Daemon di cache delle categorie di componenti - {8C7461EF-2B13-11d2-BE35-3078302C2030} - H:\WINDOWS\system32\browseui.dll
O23 - Service: Servizio Kaspersky Anti-Virus (AVP) - Kaspersky Lab ZAO - H:\Programmi\Kaspersky Lab\Kaspersky Internet Security 2011\avp.exe
O23 - Service: Servizio di Google Update (gupdate) (gupdate) - Google Inc. - H:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - H:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - H:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - H:\Programmi\Mozilla Maintenance Service\maintenanceservice.exe
O23 - Service: NMIndexingService - Nero AG - H:\Programmi\File comuni\Nero\Lib\NMIndexingService.exe
O23 - Service: NVIDIA Display Driver Service (nvsvc) - NVIDIA Corporation - H:\WINDOWS\system32\nvsvc32.exe
O23 - Service: ServiceLayer - Nokia. - H:\Programmi\File comuni\PCSuite\Services\ServiceLayer.exe
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End of file - 6572 bytes