What's a good free antivirus program for WinXP?

I have an NT server box atr work , we got hit with Nimda but kept getting "re-infected" I used Innoculan , Norton , Mcafee , and the Mcafee and Symantec nimda specific removal tools. Nothing would work for more than a day. I ran the FREE version of AVG right after ALL of the others said I was clean. It found 1 infected file in an area the others didn't. I suspect this was the one file that was re-infecting my server. I realize it may be a fluke , but I am sold.

You can get the OEM Version of Norton SystemWorks 2002 Pro for $16.45 and thats with shipping.

I found a great deal,I downloaded Weatherbug,and it send you these offers to you via email,well they had the Norton System Works the professional version for 29.95 the 2002 version,@ Best Buy it was over 100 dollars,might be wroth looking into.I bought it but haven't recieved it yet.

I've got an extra copy of Norton 2002. Dad bought a copy the day before I did . Still in the box and have not yet returned it. It's yours if ya want it...

Dr.

164 does seem low..must be real old i guess.
free online virus scan(just dont close browser window while it runs) it was recomended to me by M$ft tech help..good guys at M$ft tech help, just the really high up bosses that are greedy pigs. Enjoy!

http://housecall.antivirus.com/housecall/start_pcc.asp