AVX is not an update to AVP.. I have AVP running on my W2k Pro fine. Are you using AVP 3.1 or AVP 3.5? You have to use AVP 3.5 to run correctly on W2k. Also be aware that 3.5 will not run on any Windows Server software. For all of you that don't know what AVP is you might want to educate yourself about it. It is the BEST antivirus software out there right now.