When we get hit with a virus, it's annoying and can knock us out of commission for a bit, but a little rest (and perhaps antibiotics) and everything is eventually good again. But our PCs? It's a different story. A virus on a PC can stir up all kinds of trouble, from stealing your identity to slowing down your system to a crawl. Safe computing habits can go a long ways in preventing that sort of thing, but for an added layer of protection, check out today's top deal.