I have not been able to do a complete scan with KAV 5 (Personal or Personal Pro) as it freezes my PC. KL is still working on a solution for me and is hoping that the update to Personal Pro later this month will do the trick. I am not sure since I still can't do a complete scan with just released Personal 5.0227. One thing I have not tried is installing in Safe Mode? Is this worth a try? I noticed that Microsoft is suggesting this if you have trouble installing XP SP2. In the mean time, I have been using NOD32 and certainly like the speed...I am just not sure about the protection. So many different test results make it confusing.