Panda Software is one of the most used sites on my favorites list. I lost count as to how many times this website saved my computer from contaminated emails. Just follow a few steps, and it can scan a single file, or whole hard drive! Did I mention it is FREE?

PC-cillin is my second choice in free, online virus scan websites. The only reason being that it takes a little bit longer, and doesn't give you the option of just scanning your email program (where most of the trouble first occurs). It is a very effective site, and should be a part of your favorites too.