Salve gente sono nuovo e mi scuso in anticipo se l'argomento è già stato trattato.

Il mio pc si comporta in modo strano da qualche giorno, nel senso che quando mi connetto a Internet(Alice) dopo qualche minuto il modem "impazzisce" evidenziando un trasferimento dati, non so con chi o che cosa.
Dopo poco tempo compare un messaggio(NT authority\system) secondo il quale il file di sistema services.exe è stato terminato in modo imprevisto, parte un conto alla rovescia al termine del quale possono succedere due cose: 1) se disconnetto e spengo il modem prima dello scadere il sistema non si chiude ma rimane tutto bloccato, i programmi non partono. 2) se rimango connesso il sistema si riavvia da solo.
Ho eseguito mille scansioni con Ewido, avast, ad-aware, stinger, fixblast in modalità provvisoria e non, ma l'esito è sempre negativo. Uso il firewall di Windows e a volte Outpost. Il sistema(WinXp Home originale) è aggiornatissimo. Tengo a precisare che se accendo il pc e non uso Internet ma faccio mille altre cose, funziona tutto perfettamente.
Ho fatto una scansione con HijackThis ma io non me ne intendo, se potete aiutarmi ve ne sarei davvero grato. Vi copio qui il logfile di HijackThis:

Logfile of HijackThis v1.99.1
Scan saved at 17.13.37, on 23/12/2006
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

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\spoolsv.exe
C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\Programmi\Software Bluetooth\bin\btwdins.exe
C:\WINDOWS\system32\CTsvcCDA.EXE
C:\Programmi\ewido anti-spyware 4.0\guard.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\HPZipm12.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\SOUNDMAN.EXE
C:\Programmi\Java\jre1.5.0_09\bin\jusched.exe
C:\Programmi\Logitech\iTouch\iTouch.exe
C:\WINDOWS\system32\rundll32.exe
C:\Programmi\mobile PhoneTools\WatchDog.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Programmi\MessengerPlus! 3\MsgPlus.exe
C:\Programmi\iTunes\iTunesHelper.exe
C:\Programmi\iPod\bin\iPodService.exe
C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Software Bluetooth\BTTray.exe
C:\Programmi\Digisoft AntiDialer\AntiDialer.exe
C:\Programmi\StopDialers\StopDialer.exe
C:\Programmi\HP\Digital Imaging\bin\hpqimzone.exe
C:\Programmi\Agnitum\Outpost Firewall\outpost.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Hijackthis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = c:\secure32.html
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = c:\secure32.html
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = c:\secure32.html
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page = c:\secure32.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page_bak = http://www.google.it/
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = c:\secure32.html
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - Default URLSearchHook is missing
O2 - BHO: (no name) - SOFTWARE - (no file)
O2 - BHO: Yahoo! Companion BHO - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\Programmi\Yahoo!\Companion\Installs\cpn\ycomp5_ 6_2_0.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre1.5.0_09\bin\ssv.dll
O2 - BHO: FDMIECookiesBHO Class - {CC59E0F9-7E43-44FA-9FAA-8377850BF205} - C:\Programmi\Free Download Manager\iefdmcks.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Programmi\Yahoo!\Companion\Installs\cpn\ycomp5_ 6_2_0.dll
O4 - HKLM\..\Run: [SiSUSBRG] C:\WINDOWS\SiSUSBrg.exe
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre1.5.0_09\bin\jusched.exe "
O4 - HKLM\..\Run: [zBrowser Launcher] C:\Programmi\Logitech\iTouch\iTouch.exe
O4 - HKLM\..\Run: [mmtask] c:\Program Files\MusicMatch\MusicMatch Jukebox\mmtask.exe
O4 - HKLM\..\Run: [saap] c:\windows\ioneei~1\saap.exe
O4 - HKLM\..\Run: [nujivct] C:\WINDOWS\nujivct.exe
O4 - HKLM\..\Run: [BluetoothAuthenticationAgent] rundll32.exe bthprops.cpl,,BluetoothAuthenticationAgent
O4 - HKLM\..\Run: [WatchDog] C:\Programmi\mobile PhoneTools\WatchDog.exe
O4 - HKLM\..\Run: [CloneCDTray] "C:\Programmi\SlySoft\CloneCD\CloneCDTray.exe" /s
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [MessengerPlus3] "C:\Programmi\MessengerPlus! 3\MsgPlus.exe"
O4 - HKLM\..\Run: [iTunesHelper] "C:\Programmi\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [OutpostFeedBack] C:\Programmi\Agnitum\Outpost Firewall\feedback.exe /dumps_startup
O4 - HKLM\..\Run: [HP Software Update] C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [ISUSPM Startup] C:\PROGRA~1\FILECO~1\INSTAL~1\UPDATE~1\ISUSPM.exe -startup
O4 - HKLM\..\Run: [ISUSScheduler] "C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe" -start
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - Startup: Stop Dialers.lnk = C:\Programmi\StopDialers\StopDialer.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O4 - Global Startup: BTTray.lnk = ?
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Programmi\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Digisoft AntiDialer.lnk = C:\Programmi\Digisoft AntiDialer\AntiDialer.exe
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Programmi\HP\Digital Imaging\bin\hpqtra08.exe
O4 - Global Startup: Avvio rapido di HP Image Zone.lnk = C:\Programmi\HP\Digital Imaging\bin\hpqthb08.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Invia a &Bluetooth - C:\Programmi\Software Bluetooth\btsendto_ie_ctx.htm
O8 - Extra context menu item: Scarica con Free Download Manager - file://C:\Programmi\Free Download Manager\dllink.htm
O8 - Extra context menu item: Scarica selezionati da Free Download Manager - file://C:\Programmi\Free Download Manager\dlselected.htm
O8 - Extra context menu item: Scarica tutto con Free Download Manager - file://C:\Programmi\Free Download Manager\dlall.htm
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_09\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_09\bin\ssv.dll
O9 - Extra button: Outpost Firewall Pro Quick Tune - {44627E97-789B-40d4-B5C2-58BD171129A1} - C:\Programmi\Agnitum\Outpost Firewall\Plugins\BrowserBar\ie_bar.dll
O9 - Extra button: Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\PROGRA~1\YAHOO!\COMMON\yhexbmesit.dll
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\PROGRA~1\YAHOO!\COMMON\yhexbmesit.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: @btrez.dll,-4015 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Programmi\Software Bluetooth\btsendto_ie.htm
O9 - Extra 'Tools' menuitem: @btrez.dll,-4017 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Programmi\Software Bluetooth\btsendto_ie.htm
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
O9 - Extra button: Trashcan - {072F3B8A-2DA2-40e2-B841-88899F240200} - C:\PROGRA~1\AGNITUM\OUTPOS~1\TRASH.EXE (file missing) (HKCU)
O9 - Extra 'Tools' menuitem: Show Trashcan - {072F3B8A-2DA2-40e2-B841-88899F240200} - C:\PROGRA~1\AGNITUM\OUTPOS~1\TRASH.EXE (file missing) (HKCU)
O14 - IERESET.INF: START_PAGE_URL=http://GLOBAL.ACER.COM/
O15 - Trusted Zone: http://secure.gestrip.com (HKLM)
O15 - Trusted Zone: http://update.randhi.com (HKLM)
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {30528230-99F7-4BB4-88D8-FA1D4F56A2AB} (YInstStarter Class) - C:\Programmi\Yahoo!\Common\yinsthelper.dll
O16 - DPF: {33331111-1111-1111-1111-611111193423} - http://www.www2.p0rt2.com/files/777.cab
O16 - DPF: {33331111-1111-1111-1111-611111193429} - http://www.www2.p0rt2.com/files/_ipsec_.cab
O16 - DPF: {33331111-1111-1111-1111-615111193427} -
O16 - DPF: {33331111-1131-1111-1111-611111193428} -
O16 - DPF: {33331111-1234-1111-1111-615111193427} - http://www.www2.p0rt2.com/files/epl29bd.cab
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://update.microsoft.com/microsof...?1138649993968
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/Ms...Downloader.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{65ADD218-13BD-4C2E-BCE6-5640B659792D}: NameServer = 85.37.17.40 85.38.28.85
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O20 - AppInit_DLLs: C:\PROGRA~1\Agnitum\OUTPOS~1\wl_hook.dll
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O20 - Winlogon Notify: winjvd32 - winjvd32.dll (file missing)
O21 - SSODL: SystemCheck2 - {54645654-2225-4455-44A1-9F4543D34546} - C:\WINDOWS\system32\vbsys2.dll (file missing)
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
O23 - Service: Adobe LM Service - Unknown owner - C:\Programmi\File comuni\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: Bluetooth Service (btwdins) - WIDCOMM, Inc. - C:\Programmi\Software Bluetooth\bin\btwdins.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.EXE
O23 - Service: ewido anti-spyware 4.0 guard - Anti-Malware Development a.s. - C:\Programmi\ewido anti-spyware 4.0\guard.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iPodService - Apple Computer, Inc. - C:\Programmi\iPod\bin\iPodService.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
O23 - Service: Sandra Data Service (SandraDataSrv) - SiSoftware - C:\Programmi\SiSoftware\SiSoftware Sandra Lite 2007.SP1\Win32\RpcDataSrv.exe
O23 - Service: Sandra Service (SandraTheSrv) - SiSoftware - C:\Programmi\SiSoftware\SiSoftware Sandra Lite 2007.SP1\RpcSandraSrv.exe

Vi ringrazio anticipatamente per l'aiuto, vi prego ditemi che devo fare perchè senza internet muoio