I am using XP SP2 and SP3 and have tried both McAfee 8.5i and 8.7i with all the latest patches. McAfee has been real crappy at trying to solve this problem. I have just kind of live with this problem for months but it's getting so annoying. For me, my experience is that the computer right after boot up would freeze up for about 1-2 minutes. This would happen immediately if i start Internet Explorer. Then the computer would unfreeze with windows security alert saying mcafee is not running as mcafee would quit for a few seconds then it restarts. This would repeat every time i try to open IE or something for exactly 4 times. Then after that, i can get on with my usage and this problem would never come up again until next reboot time. I ve been able to kind of live with it as it only prolongs my time before i can start using the computer as i kind of count it as part of the boot time. But it is extremely annoying.....