Christina,
I'm not that knowledgeable with this kind of stuff either. My Dad is a computer instructor so I guess I could ask him, but anyways heres my take on it. From what I understand there are different types of viruses that can do different things to your hard drive. Sometimes they erase files or they might make it so you cant open a particular application, or even boot up your computer. I guess it all depends. The main thing is to have a Virus Scan Application installed on your computer. This Application should tell you when you do have a virus anytime you boot up or you do a scan with the application. I have Norton Anti-Virus and they come up with monthly updates which help cover the new viruses out there.
Kevin
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