Hi,
The site was down the other day for upgrade - now it's definitely 5.5. I installed it at home and found 22 of the little buggers, and at work I found 45. Make sure that when you run it you choose every part of your computer - usually hitting my computer works. Otherwise it won't scan everywhere.
In a related note - ever since I joined these reward programs I have been getting tons of email. Many messages contain a new virus, the W32.Sircam.Worm@mm virus. Check out a reputable virus site like norton - symantec.com and you will see how to clean it. In the meantime, if you get any messages asking you to review a document, scan the doc before downloading.
Good luck with getting rid of critters!