Has Security essentials passed the "Designed for Microsoft Windows XP logo" as I get this error message on updates.(running Xp home SP3- with a 20 min boot up - no virus found before this update)1 person needs an answerI do too

Yes, Microsoft Security Essentials is fully compatible with Windows XP SP3. Make sure you download it from original website NOT P2P sharing or other website.Try uninstall it and reinstall from:http://www.microsoft.com/security_essentials/default.aspx