Ciao,
ho fatto esattamente tutto, ma il problema si è puntualmente ripresentato. Ho scaricato un programma che ha tracciato il crash, copio il report se può essere utile:
On Mon 31/03/2014 20.37.01 GMT your computer crashed
crash dump file: C:\Windows\Minidump\Mini033114-03.dmp
This was probably caused by the following module: aswndis2.sys (aswNdis2+0x6A5C)
Bugcheck code: 0xC8 (0x0, 0x2, 0x0, 0x0)
Error: IRQL_UNEXPECTED_VALUE
file path: C:\Windows\system32\drivers\aswndis2.sys
product: avast! Antivirus
company: AVAST Software
description: avast! Filtering NDIS driver
Bug check description: This indicates that the processor's IRQL is not what it should be at this time.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: aswndis2.sys (avast! Filtering NDIS driver, AVAST Software).
Google query: AVAST Software IRQL_UNEXPECTED_VALUE