If it only happened once, ignore it.

BSODs aren't usually virus-related, though.

If it keeps happening, make a list of all the drivers and third-party software which load on startup, and try using the computer with one of them removed at a time. If the bluescreens fail to come up, try reinstalling or replacing whichever piece of software you had disabled at the time.

Alternatively, Google the codes from the BSOD and see if they're linked to a common cause. This can be a faster way to diagnose and address some problems, and includes hardware issues.