READ: Are Security Vendors (NIS & McAfee IS) Tricking XP SP2?

Microsoft says its Service Pack 2 update adds an additional layer of security to Windows XP-based PCs. However, recent PCW tests seem to show that at least two major security suites are crippling SP2's ability to offer users accurate security information.

SP2, which Microsoft rolled out in August, includes the new Windows Security Center. This feature alerts users when their PC's antivirus or firewall software is missing or out of date. It also signals when the real-time virus scanner is disabled, and when the firewall is not enabled. At least, that's how it's supposed to work.

However, when we installed Symantec's Norton Internet Security 2005 and McAfee's Internet Security Suite 2005 on a system running SP2, both apps caused the Windows Security Center to erroneously report that the products were up-to-date. Any antivirus software, whether downloaded via the Internet or purchased at retail, will need its signatures updated when it is first installed. This is because they need to reflect any new viruses that were discovered between the time the product was created and when it was installed.

Full story: PC World

I am not yet running SP2, and dont use either of the above packages, but if this is happenning, its not good.