ho fatto una scansione anche con CWSHredder, ecco il log:

CWShredder v1.59.0 scan only report
Please understand that a CWShredder 'Scan only' report
might not be sufficient to troubleshoot an infected system.
You can use HijackThis for that:
http://www.merijn.org/files/hijackthis.zip
http://www.spywareinfo.com/~merijn/files/hijackthis.zip



Hosts file not present
Shell Registry value: HKLM\..\WinLogon [Shell] Explorer.exe
UserInit Registry value: HKLM\..\WinLogon [UserInit] C:\WINDOWS\system32\userinit.exe,
Found Win.ini file: C:\WINDOWS\win.ini (638 bytes, A)
Found System.ini file: C:\WINDOWS\system.ini (254 bytes, A)