Further to my last query about why the XP SP2 Security Center doesn't recognise Norton AV 2002 even with all its current updates, this is from the Symantec support site:
Q: Why does the Windows Security Center say that the status of my Norton security product is "unknown."
A: Your Norton security products contain tamper protection features that prevent malicious code from determining their status. This tamper protection also prevents the Windows Security Center from determining the status of your Norton security products. Shortly after Microsoft releases Service Pack 2, Symantec will make a correction available through LiveUpdate. This correction will allow the Windows Security Center to correctly identify the status of your Norton security products.
So hopefully it won't be long before there's a patch to correct the mis-reporting of Norton AV 2002 status!