Here is what CRN had to say
" SP2 will wreak havoc on many security and firewall software utilities, forcing a redesign of antivirus suites, e-mail clients and firewalls. Test Center engineers installed SP2 on systems with utilities including Panda Software, Trend Micro, Symantec and Avast antivirus software, and all worked seamlessly. "
http://www.crn.com/
SP2 worked great on mine,P3 XP Pro (original install 3 yrs ago now)
-max