"When you get the message: Checking CRC of NOD32.exe file is corrupted possibly due to infection."
Is there something like the following also presented:
"A variant of xxx virus found in operating memory. No action can be taken while the file is in memory. Click "Leave" to continue and subsequently run the cleaning of all local disks. System memory infection originated from file C:\WINDOWS\system32\xxx.exe" (were xxx is a specific file)
If so, can you post the info?
The situation is probably "I was unaware of the virus in my computer"
Retired - Doin' Dis, Dat, and slapping malware.