ok sono riuscito a ripristinare tutto ecco il log:
Logfile of HijackThis v1.99.1
Scan saved at 0.46.00, on 11/11/2005
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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Programmi\Internet Explorer\iexplore.exe
c:\progra~1\intern~1\iexplore.exe
C:\Programmi\MSN Messenger\msnmsgr.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\HJThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.mmwkajjhzpii.com/EyRoGPfm...KbWB0BBSX.html
O4 - HKCU\..\Run: [Dog corn] C:\DOCUME~1\PAOLOD~1\DATIAP~1\MAPIHI~1\userheck.ex e
O17 - HKLM\System\CCS\Services\Tcpip\..\{A12CBC2D-422D-4B06-A261-A20C40A3095E}: NameServer = 85.37.17.11 151.99.125.1

help me....