There's a free update available weekly at the following McAfee link. No names, no pack drill. Just log on, download the appropriate file, run the "*.exe" file and Bob's your Uncle. You can even Update the engine of your ViruScan software if it is recent enough.
http://www.mcafee-at-home.com/naicom...ad/updates.asp
It takes very little effort, but as to whether its worthwhile well, thats the $64,000 question. I don't know.