When the heuristic scanner of CPAV thinks it might have found a
virus from a boot sector, it calls it 'Viral Code B'. If the
suspicous code is found from a file, it's called 'Viral Code F'.
This doesn't necessarily mean the files or boot sectors are actually
infected, they might just contain suspicous code. In any case, you
should have the files or boot sectors checked to make sure whether it's
a false alarm from CPAV or a real virus.
[Analysis: Mikko Hypponen, F-Secure]