With all of the viruses going around lately, you should definately have a good AntiVirus.
I was recently infected with the NIMDA32 worm virus, and lost a lot of important files.
That's when I decided I was going to make this Trojan Cleaner.
It currently scans for NIMDA32, GlobalThreat, Evilbot, PentagoneX, and a few other popular trojans.
Here is a screenshot of my program, feel free to download and tell your friends about it.
It's freeware, which means, you don't have to pay for it, unlike most AntiViruses.