Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 00:56, on 2009-07-31
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16850)
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:\Programmi\Windows Defender\MsMpEng.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\brsvc01a.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\brss01a.exe
C:\Programmi\File comuni\Microsoft Shared\VS7Debug\mdm.exe
C:\WINDOWS\system32\HPZipm12.exe
C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
C:\WINDOWS\system32\svchost.exe
C:\VEXPLITE\viritsvc.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\wscntfy.exe
C:\Programmi\Yahoo!\Messenger\YahooMessenger.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Trend Micro\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://login.yahoo.com/config/mail?.intl=it&.src=ym
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\Internet Explorer\SearchURL,(Default) = http://it.rd.yahoo.com/customize/ie/defaults/su/msgr7/*http://it.search.yahoo.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre6\bin\jp2ssv.dll (file missing)
O4 - HKCU\..\Run: [Yahoo! Pager] "C:\Programmi\Yahoo!\Messenger\YahooMessenger.exe" -quiet
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\S-1-5-18\..\Run: [DWQueuedReporting] "C:\PROGRA~1\FILECO~1\MICROS~1\DW\dwtrig20.exe" -t (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: &Clean Traces - C:\Programmi\DAP\Privacy Package\dapcleanerie.htm
O8 - Extra context menu item: &Download with &DAP - C:\Programmi\DAP\dapextie.htm
O8 - Extra context menu item: Download &all with DAP - C:\Programmi\DAP\dapextie2.htm
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O12 - Plugin for .pdf: C:\Programmi\Internet Explorer\PLUGINS\nppdf32.dll
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: {8714912E-380D-11D5-B8AA-00D0B78F3D48} (Yahoo! Webcam Upload Wrapper) - http://chat.yahoo.com/cab/yuplapp.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O23 - Service: BrSplService (Brother XP spl Service) - brother Industries Ltd - C:\WINDOWS\system32\brsvc01a.exe
O23 - Service: Macromedia Licensing Service - Unknown owner - C:\Programmi\File comuni\Macromedia Shared\Service\Macromedia Licensing.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
O23 - Service: Virit eXplorer Lite (viritsvclite) - TG Soft Sas www.tgsoft.it - C:\VEXPLITE\viritsvc.exe

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End of file - 4179 bytes

Prova a riparare la connessione con questo link:
http://security.p2pforum.it/riparare-connessione-di-rete-in-windows-xp
Oppure:
http://mondoemule.blogspot.com/2008/08/winsock-xp-fix-ripristinare-la.html
Il log è pulito.

fatto tutto ma senza risultato. appena provo a connetermi si spenge. che faccio, formatto ?

ok, ti faro' sapere. comunque grazie

Ciao mammetta .
Toh.... alle volte, sembra un problema insormontabile....e invece è una cazzata.
In tutti i casi, il pc era molto infettato (Dialer e troyan), ma non capivo perchè nonostante la loro eliminazione, non riuscivi a connetterti. (sia il Dialer, che i Troyan, non avevano rapporti con la connessione)
Probabilmente i drivers della webcam , (attiva all'avvio) interferiva in qualche modo con la connessione.
A proposito, come ti è venuto in mente, di disistallare la webcan?
Sono contento che hai evitato il format.
Se hai bisogno di qualcosa fammelo sapere.