McAfee 5.16

I am using windows 2000 and whenever my users log on McAfee says that it is missing virus dat files. I can't reinstall them because the super dat reports that I am using the most current version. When i check the version when user's are logged in the version number is 0.00 This happens every so often and I have to completely uninstall and reinstall the program. Any ideas?

Well, the McAfee website notes that the application is for 95/98/NT but not 2000. Their new 5.2 works with 2000.

I wasn't able to find anything to work with 2000 save for Inoculate IT which is free. Works fine on my 2000 PC's.
http://www.antivirus.ca.com/