I just downloaded Microsoft Security Essentials, and, depending on your situation, I recommend you do it too.

MSSE is free antivirus software, from Microsoft. It's not the best thing out there, but it's far from the worst. If you don't have any antivirus software, go get it.

The usual suspects fell all over themselves to heap praise on MSSE. Some people never saw a Microsoft product they didn't like, so no surprises here.

I trust PC Magazine a whole lot more. They found it was overall a decent product. Not top-tier, but much better than nothing, and it didn't interfere much with system performance.

That's the knock on a lot of AV software. Uninstall the preloaded Norton Antivirus from the computer you bought at Office Depot, and suddenly your $399 computer feels like a $3999 computer. And it might also, like, work or something. (My mom's HP gave random filesystem errors until I uninstalled that scourge on humanity.)

If you can afford NOD32, I continue to believe it's the best overall antivirus product out there. It's fast, it's reasonably priced, it catches more than any Symantec product does, and it slows the system down a lot less. It's better than McAfee's products too.

But if you can't afford NOD32, I suggest running MSSE. And frankly, even if you paid and subscribed to a Symantec/Norton or McAfee product, I don't think you lose much by switching. Regardless, it's definitely better than running nothing.