mi controllate il seguente log...???
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 20.06.25, on 23/09/2009
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16876)
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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Lavasoft\Ad-Aware\aawservice.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Avira\AntiVir Desktop\sched.exe
C:\Programmi\Avira\AntiVir Desktop\avguard.exe
C:\Programmi\File comuni\Autodesk Shared\Service\AdskScSrv.exe
C:\WINDOWS\system32\DRIVERS\CDANTSRV.EXE
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\File comuni\Microsoft Shared\VS7Debug\mdm.exe
C:\Programmi\Autodesk\3dsMax8\mentalray\satellite\raysat_3dsmax8server.exe
C:\WINDOWS\system32\HPZipm12.exe
C:\WINDOWS\system32\slserv.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\Programmi\digicomt\Michelangelo USB ADSL\CnxDslTb.exe
C:\Programmi\Avira\AntiVir Desktop\avgnt.exe
C:\Programmi\QuickTime\qttask.exe
C:\Programmi\Search Guard Plus\SearchGuardPlus.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Microsoft ActiveSync\WCESCOMM.EXE
C:\Documents and Settings\sergio\Impostazioni locali\Dati applicazioni\Screamer Radio\screamer.exe
C:\Program Files\Real\RealPlayer\realplay.exe
C:\Programmi\Trend Micro\HijackThis\HijackThis.exe
C:\WINDOWS\system32\wuauclt.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://it.msn.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
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: Yahoo! Companion BHO - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\Programmi\Yahoo!\Companion\Installs\cpn\ycomp5_5_7_0.dll
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: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\programmi\google\googletoolbar2.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Programmi\Google\GoogleToolbarNotifier\2.0.301.7164\swg.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
O2 - BHO: Search Assistant - {F0626A63-410B-45E2-99A1-3F2475B2D695} - C:\Programmi\SGPSA\BHO.dll
O2 - BHO: XBTBPos00 - {FCBCCB87-9224-4B8D-B117-F56D924BEB18} - C:\Programmi\Fast Browser Search\IE\FBStoolbar.dll
O3 - Toolbar: Yahoo! Companion - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Programmi\Yahoo!\Companion\Installs\cpn\ycomp5_5_7_0.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\programmi\google\googletoolbar2.dll
O3 - Toolbar: Fast Browser Search Toolbar - {1BB22D38-A411-4B13-A746-C2A4F4EC7344} - C:\Programmi\Fast Browser Search\IE\FBStoolbar.dll
O4 - HKLM\..\Run: [ATIPTA] C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [NSLauncher] C:\Programmi\Nokia\Nokia Software Launcher\NSLauncher.exe /startup
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [CnxDslTaskBar] "C:\Programmi\digicomt\Michelangelo USB ADSL\CnxDslTb.exe"
O4 - HKLM\..\Run: [avgnt] "C:\Programmi\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Programmi\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [SGPUpdater] C:\Programmi\Search Guard PlusU\sgpUpdaters.exe
O4 - HKLM\..\Run: [FBSearch] C:\Programmi\Search Guard Plus\SearchGuardPlus.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [H/PC Connection Agent] "C:\Programmi\Microsoft ActiveSync\WCESCOMM.EXE"
O4 - HKCU\..\Run: [swg] C:\Programmi\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.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: &Google Search - res://C:\Programmi\Google\GoogleToolbar1.dll/cmsearch.html
O8 - Extra context menu item: Backward &Links - res://C:\Programmi\Google\GoogleToolbar1.dll/cmbacklinks.html
O8 - Extra context menu item: Cac&hed Snapshot of Page - res://C:\Programmi\Google\GoogleToolbar1.dll/cmcache.html
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~4\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Si&milar Pages - res://C:\Programmi\Google\GoogleToolbar1.dll/cmsimilar.html
O8 - Extra context menu item: Translate into English - res://C:\Programmi\Google\GoogleToolbar1.dll/cmtrans.html
O9 - Extra button: Crea preferiti portatile - {2EAF5BB1-070F-11D3-9307-00C04FAE2D4F} - C:\Programmi\Microsoft ActiveSync\inetrepl.dll
O9 - Extra button: (no name) - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\Programmi\Microsoft ActiveSync\inetrepl.dll
O9 - Extra 'Tools' menuitem: Crea preferiti portatile... - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\Programmi\Microsoft ActiveSync\inetrepl.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~4\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: {2F0455A5-CE11-4987-9613-274061D6E1FF} - http://www.milosbeach.gr/CubisActiveX.cab
O16 - DPF: {E2883E8F-472F-4FB0-9522-AC9BF37916A7} - http://platformdl.adobe.com/NOS/getPlusPlus/1.6/gp.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{4132FEEA-2767-4033-B1F7-2FCB06C63BF0}: NameServer = 151.99.125.1
O23 - Service: Lavasoft Ad-Aware Service (aawservice) - Lavasoft - C:\Programmi\Lavasoft\Ad-Aware\aawservice.exe
O23 - Service: Avira AntiVir Scheduler (AntiVirScheduler) - Avira GmbH - C:\Programmi\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira AntiVir Guard (AntiVirService) - Avira GmbH - C:\Programmi\Avira\AntiVir Desktop\avguard.exe
O23 - Service: Ati HotKey Poller - Unknown owner - C:\WINDOWS\System32\Ati2evxx.exe
O23 - Service: Autodesk Licensing Service - Autodesk - C:\Programmi\File comuni\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: C-DillaSrv - C-Dilla Ltd - C:\WINDOWS\system32\DRIVERS\CDANTSRV.EXE
O23 - Service: Google Updater Service (gusvc) - Google - C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: Servizio iPod (iPod Service) - Apple Inc. - C:\Programmi\iPod\bin\iPodService.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: RaySat_3dsmax8 Server (mi-raysat_3dsmax8) - Unknown owner - C:\Programmi\Autodesk\3dsMax8\mentalray\satellite\raysat_3dsmax8server.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
O23 - Service: ServiceLayer - Nokia. - C:\Programmi\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: SmartLinkService (SLService) - - C:\WINDOWS\SYSTEM32\slserv.exe

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End of file - 8904 bytes

grazie in anticipo, ultimamente mi si blocca spesso l'explorer...!!!

A parte questo programma, che non conosco :Search Guard Plus il log non presenta grosse anomalie.

Elimina questa voce:

O16 - DPF: {2F0455A5-CE11-4987-9613-274061D6E1FF} - http://www.milosbeach.gr/CubisActiveX.cab

Puoi disistallare Ad-Aware, oltre a essere pesante, è anche scadente.

Dai una pulita (registro compreso)con CCleaner http://www.aiutaamici.com/software?ID=11223
Nella schermata iniziale di CCleaner, clicca su Opzioni e poi Avanzate, togli il segno di spunta a: Cancella i file in Windows Temp solo se più vecchi di 48 ore. (poi esegui le pulizie)
Poi:
Start\Esegui\copia e incolla la stringa %temp% clicca su Ok, svuota la cartella temp. (non eliminare la cartella)
Poi:
Provvedi a svuotare del suo contenuto la cartella Prefetch :
clicca su Risorse del Computer
clicca su Disco locale C:
cerca, all’interno delle cartelle che saranno visualizzate la cartella Windows, aprila ed, al suo interno, cerca la cartella Prefetch, la apri ed elimina tutte le voci conservate al suo interno ( non eliminare la cartella)
SVUOTA IL CESTINO
Poi:
Lancia Hijackthis e pulisci gli ADS in questo modo:(esclusivamente, su partizioni in NTFS):
clicca sulla voce Open the misc tool section
clicca su Open ads spy
togli la spunta alla voce Quick scan (windows base folder only)
clicca su Scan.
Aspetta pazientemente la fine della scansione.
se venissero rilevati ADS, spunta tutte (senza paura) le caselline e clicca su Remove selected
Riavvia il pc.

Scarica ed installa MalwareBytes: (tienilo installato al posto di Ad-Aware)

clicca qui per il download : http://www.aiutamici.com/software?id=80346
Prima di fare la scansione AGGIORNALO. (è molto importante)
Esegui una scansione completa del sistema.
Posta il log.