il processo Explore.exe occupa la cpu al 99:, come suggerito da Alfonso ho copiato il log.
Grazie Alessandro

Logfile of HijackThis v1.99.1
Scan saved at 22.18.56, on 27/09/2005
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:\Programmi\Ahead\InCD\InCDsrv.exe
C:\WINDOWS\system32\spoolsv.exe
C:\PROGRAMMI\AVPERSONAL\AVGUARD.EXE
C:\Programmi\Apache Group1\Apache\Apache.exe
C:\Programmi\AVPersonal\AVWUPSRV.EXE
C:\WINDOWS\System32\drivers\CDAC11BA.EXE
C:\Programmi\File comuni\Microsoft Shared\VS7Debug\mdm.exe
C:\Programmi\Apache Group1\Apache\Apache.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\windows\system\hpsysdrv.exe
C:\HP\KBD\KBD.EXE
C:\WINDOWS\System32\rundll32.exe
C:\Programmi\Messenger Plus! 3\MsgPlus.exe
C:\Programmi\Java\jre1.5.0_01\bin\jusched.exe
C:\Programmi\AVPersonal\AVGNT.EXE
C:\Programmi\Ahead\InCD\InCD.exe
C:\WINDOWS\System32\rundll32.exe
C:\Programmi\Adobe\Acrobat 6.0\Distillr\acrotray.exe
C:\WINDOWS\System32\taskmgr.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Documents and Settings\Proprietario\Desktop\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.virgilio.it/
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://as.starware.com/dp/search?x=wKX1ILEOi+Vh7AfA98Gm4Me69ZMbubcDmYReEEaH4pWX0+zP0BVqxW/RlXmL0e+0vNuCSWvLRSdZvercW4DS9i9Hr+RT1Amloc1ORZiJZkybYA37BXpurRNzX+UvSoRi+I0Y0RWqejZuDgzcWvhWCN3ZzqBjAmZYmcI+YPgCme6u0hWYAsCn5OfqO2jeFZ9V
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - Default URLSearchHook is missing
O1 - Hosts: 64.233.167.104 www.symantec.com
O1 - Hosts: 64.233.167.104 securityresponse.symantec.com
O1 - Hosts: 64.233.167.104 symantec.com
O1 - Hosts: 64.233.167.104 kaspersky-labs.com
O1 - Hosts: 64.233.167.104 sandbox.norman.no
O1 - Hosts: 64.233.167.104 www.pandasoftware.com
O1 - Hosts: 64.233.167.104 uk.trendmicro-europe.com
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 6.0\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\programmi\google\googletoolbar2.dll
O2 - BHO: AcroIEToolbarHelper Class - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Programmi\Adobe\Acrobat 6.0\Acrobat\AcroIEFavClient.dll
O2 - BHO: Starware - {CA356D79-679B-4b4c-8E49-5AF97014F4C1} - C:\Programmi\Starware\bin\Starware.dll
O3 - Toolbar: andRadio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Programmi\Adobe\Acrobat 6.0\Acrobat\AcroIEFavClient.dll
O3 - Toolbar: Starware - {D49E9D35-254C-4c6a-9D17-95018D228FF5} - C:\Programmi\Starware\bin\Starware.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\programmi\google\googletoolbar2.dll
O4 - HKLM\..\Run: [hpsysdrv] c:\windows\system\hpsysdrv.exe
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /installquiet /keeploaded /nodetect
O4 - HKLM\..\Run: [KBD] C:\HP\KBD\KBD.EXE
O4 - HKLM\..\Run: [StorageGuard] "C:\Programmi\File comuni\Sonic\Update Manager\sgtray.exe" /r
O4 - HKLM\..\Run: [Recguard] C:\WINDOWS\SMINST\RECGUARD.EXE
O4 - HKLM\..\Run: [ATIModeChange] Ati2mdxx.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [PS2] C:\WINDOWS\system32\ps2.exe
O4 - HKLM\..\Run: [Windows Automation] mslaugh.exe
O4 - HKLM\..\Run: [il mio dolce tesoro] monycom.exe
O4 - HKLM\..\Run: [AdslTaskBar] rundll32.exe stmctrl.dll,TaskBar
O4 - HKLM\..\Run: [Microsoft Inet Xp..] teekids.exe
O4 - HKLM\..\Run: [PrimaLauncher] C:\WINDOWS\System32\Launcher.exe
O4 - HKLM\..\Run: [windows] hkey.exe
O4 - HKLM\..\Run: [Norton Antivirus AV] C:\WINDOWS\FVProtect.exe
O4 - HKLM\..\Run: [Microsoft Update] msawindows.exe
O4 - HKLM\..\Run: [AlcxMonitor] ALCXMNTR.EXE
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [MessengerPlus3] "C:\Programmi\Messenger Plus! 3\MsgPlus.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Programmi\Java\jre1.5.0_01\bin\jusched.exe
O4 - HKLM\..\Run: [AVGCtrl] C:\Programmi\AVPersonal\AVGNT.EXE /min
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [InCD] C:\Programmi\Ahead\InCD\InCD.exe
O4 - HKLM\..\RunServices: [windows] hkey.exe
O4 - HKLM\..\RunServices: [Microsoft Update] msawindows.exe
O4 - HKCU\..\Run: [NVIEW] rundll32.exe nview.dll,nViewLoadHook
O4 - HKCU\..\Run: [Shareaza] "C:\Programmi\Shareaza\Shareaza.exe" -tray
O4 - Global Startup: Acrobat Assistant.lnk = C:\Programmi\Adobe\Acrobat 6.0\Distillr\acrotray.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: AutoCAD Startup Accelerator.lnk = C:\Programmi\File comuni\Autodesk Shared\acstart16.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O4 - Global Startup: Post-it® Software Notes.lnk = C:\Programmi\3M\PSNotes\PSNOTES.EXE
O8 - Extra context menu item: &Cerca con Google - res://C:\Programmi\Google\GoogleToolbar2.dll/cmsearch.html
O8 - Extra context menu item: &Traduci parola in italiano - res://C:\Programmi\Google\GoogleToolbar2.dll/cmwordtrans.html
O8 - Extra context menu item: Link a ritroso - res://C:\Programmi\Google\GoogleToolbar2.dll/cmbacklinks.html
O8 - Extra context menu item: Pagine simili - res://C:\Programmi\Google\GoogleToolbar2.dll/cmsimilar.html
O8 - Extra context menu item: Versione cache della pagina - res://C:\Programmi\Google\GoogleToolbar2.dll/cmcache.html
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_01\bin\npjpi150_01.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_01\bin\npjpi150_01.dll
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
O12 - Plugin for .nmz: C:\Programmi\Internet Explorer\Plugins\NPScr32.dll
O16 - DPF: {00B71CFB-6864-4346-A978-C0A14556272C} (Checkers Class) - http://messenger.zone.msn.com/binary/msgrchkr.cab31267.cab
O16 - DPF: {14B87622-7E19-4EA8-93B3-97215F77A6BC} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPAClient.cab31267.cab
O16 - DPF: {4F1E5B1A-2A80-42CA-8532-2D05CB959537} (MSN Photo Upload Tool) - http://spaces.msn.com//PhotoUpload/MsnPUpld.cab
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsClient.cab31267.cab
O16 - DPF: {917623D1-D8E5-11D2-BE8B-00104B06BDE3} (CamImage Class) - http://81.115.250.18/activex/AxisCamControl.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/MsnMessengerSetupDownloader.cab
O16 - DPF: {B8BE5E93-A60C-4D26-A2DC-220313175592} (ZoneIntro Class) - http://messenger.zone.msn.com/binary/ZIntro.cab32846.cab
O16 - DPF: {BFF1950D-B1B4-4AE8-B842-B2CCF06D9A1B} (Zylom Games Player) - http://game11.zylomgames.com/activex/zylomgamesplayer.cab
O16 - DPF: {CE69F98F-2AF3-4306-BAC6-A79070EDA1B4} (Zylom Loader Object) - http://game12.zylomgames.com/activex/zylomloader.cab
O16 - DPF: {F58E1CEF-A068-4C15-BA5E-587CAF3EE8C6} (MSN Chat Control 4.5) - http://chat.msn.com/bin/msnchat45.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{5664F41D-AD19-4CC6-AFAA-12B8DCDAC3D0}: NameServer = 85.37.17.5 151.99.125.1
O17 - HKLM\System\CS1\Services\Tcpip\..\{5664F41D-AD19-4CC6-AFAA-12B8DCDAC3D0}: NameServer = 85.37.17.5 151.99.125.1
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O20 - AppInit_DLLs: MsgPlusLoader.dll
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxsrvc.dll
O23 - Service: AntiVir Service (AntiVirService) - H+BEDV Datentechnik GmbH - C:\PROGRAMMI\AVPERSONAL\AVGUARD.EXE
O23 - Service: Apache - Unknown owner - C:\Programmi\Apache Group1\Apache\Apache.exe" --ntservice (file missing)
O23 - Service: Autodesk Licensing Service - Autodesk, Inc. - C:\Programmi\File comuni\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: AntiVir Update (AVWUpSrv) - H+BEDV Datentechnik GmbH, Germany - C:\Programmi\AVPersonal\AVWUPSRV.EXE
O23 - Service: C-DillaCdaC11BA - C-Dilla Ltd - C:\WINDOWS\System32\drivers\CDAC11BA.EXE
O23 - Service: InCD Helper (InCDsrv) - Ahead Software AG - C:\Programmi\Ahead\InCD\InCDsrv.exe
O23 - Service: MySql - Unknown owner - C:\PROGRA~1\EASYPH~1\MySql\bin\mysqld.exe (file missing)
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe

Ciao ,
esegui queste operazioni

1) Disattiva il ripristino di configurazione, leggi qui come fare
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=257&SH=N

2) riavvia in modalità provvisoria, leggi qui come fare
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=344&SH=N

apri HIJAC THIS ed elimina come indicato in questo articolo
http://www.aiutamici.com/software/descrizione.asp?CodSw=1175
le righe che seguono, (nel caso le righe da eliminare non compaiono in modalità provvisoria, eliminale dalla modalità normale e riavvia il computer).

==================================
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://as.starware.com/dp/search?x=wKX1ILEOi+Vh7AfA98Gm4Me69ZMbubcDmYReEEaH4pWX0+zP0BVqxW/RlXmL0e+0vNuCSWvLRSdZvercW4DS9i9Hr+RT1Amloc1ORZiJZkybYA37BXpurRNzX+UvSoRi+I0Y0RWqejZuDgzcWvhWCN3ZzqBjAmZYmcI+YPgCme6u0hWYAsCn5OfqO2jeFZ9V
-
R3 - Default URLSearchHook is missing
O1 - Hosts: 64.233.167.104 www.symantec.com
O1 - Hosts: 64.233.167.104 securityresponse.symantec.com
O1 - Hosts: 64.233.167.104 symantec.com
O1 - Hosts: 64.233.167.104 kaspersky-labs.com
O1 - Hosts: 64.233.167.104 sandbox.norman.no
O1 - Hosts: 64.233.167.104 www.pandasoftware.com
O1 - Hosts: 64.233.167.104 uk.trendmicro-europe.com
-
O4 - HKLM\..\Run: [Windows Automation] mslaugh.exe
O4 - HKLM\..\Run: [il mio dolce tesoro] monycom.exe
-
O4 - HKLM\..\Run: [Microsoft Inet Xp..] teekids.exe
O4 - HKLM\..\Run: [PrimaLauncher] C:\WINDOWS\System32\Launcher.exe
O4 - HKLM\..\Run: [windows] hkey.exe
O4 - HKLM\..\Run: [Norton Antivirus AV] C:\WINDOWS\FVProtect.exe
O4 - HKLM\..\Run: [Microsoft Update] msawindows.exe
O4 - HKLM\..\Run: [AlcxMonitor] ALCXMNTR.EXE
-
O4 - HKLM\..\RunServices: [windows] hkey.exe
O4 - HKLM\..\RunServices: [Microsoft Update] msawindows.exe
-
O23 - Service: Apache - Unknown owner - C:\Programmi\Apache Group1\Apache\Apache.exe" --ntservice (file missing)
-
O23 - Service: MySql - Unknown owner - C:\PROGRA~1\EASYPH~1\MySql\bin\mysqld.exe (file missing)
==================================

Con la funzione TROVA di Windows, cerca ed elimina questi file,

==================================
mslaugh.exe
monycom.exe
teekids.exe
Launcher.exe
hkey.exe
FVProtect.exe
msawindows.exe
ALCXMNTR.EXE
==================================


Vai a PANNELLO DI CONTROLLO e clicca su OPZIONI INTERNET
nella finestra che si apre clicca i tre pulsanti
ELIMINA COOKIES - ELIMINA FILE - CANCELLA CRONOOLOGIA


al termine utilizza i programmi AD-AWARE e SPYBOT indicati in questo articolo
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=388&SH=N

Fai una scansione con questo programma
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=1286

sempre in modalità provvisoria fai una scansione Antivirus

quindi riavvia il computer e controlla se il problema e risolto, se e tutto OK riattiva il ripristino configurazione disattivato all'inizio di questa procedura.

Nel sistema manca un programma Firewall, installa questo
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=56

Inoltre aggiorna il sistema dal Windows Update.

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Collaboratore Aiutamici