Could you clarify (for the benefit of real experts, not me) what programs are giving the problem...
Are they setup/install programs that you run on your PC? And if so, downloaded from somewhere or built by you? What OS are you running?
Similarly, if not, are they Basic4PPC programs meant for the desktop, and acquired from where?
Presumably you are not referring to programs actually being run on a PPC device, or do you have Norton running there?
Mike.