And, like viruses in humans, these programs can cause a whole symphony of "symptoms." Some are harmless and irritating, while others can delete files or corrupt your computer. In either case, it causes your computer not to function as it should. The best way to protect against such “bugs” is to run an anti-virus application. These stop viruses in their tracks! But even anti-virus programs need to be updated regularly because, like viruses in people, computer viruses are always mutating. So, be careful what emails you open, and use an anti-virus program and you’ll keep the bugs out of your PC!