con HijackThis fix queste

O4 - HKLM\..\Run: [drvkmsuh] "e:\windows\system32\drvkmsuh.exe

O23 - Service: AMOSK - Unknown owner - E:\DOCUME~1\Arianna\IMPOST~1\Temp\AMOSK.exe (file missing)

O23 - Service: JWPZFFEESTT - Unknown owner - E:\DOCUME~1\Arianna\IMPOST~1\Temp\JWPZFFEESTT.exe (file missing)

O23 - Service: OVVEWOT - Unknown owner - E:\DOCUME~1\Arianna\IMPOST~1\Temp\OVVEWOT.exe (file missing)

elimina se presente:
e:\windows\system32\drvkmsuh.exe

Scarica PSERV.CPL
http://p-nand-q.com/download/pserv_cpl/pserv-2.6.exe

Clic con il tasto dex sul nome del servizio

Service: AMOSK.exe
Service:JWPZFFEESTT
Service:OVVEWOT

seleziona "Delete"

Ciao caro