Apache 2 Incompatibility issue?

Hi, I have a Compaq V2000 laptop with XP Home and Apache 2.2.4 installed. After I installed Comodo Antivirus, the CPU usage is 100% all the time. If I stop the apache service, the CPU usage is going back to normal. I tried to uninstall and install again Comodo Antivirus, I tried with all Antivirus Actions turned off, the CPU usage is still 100% if the apache service is started. I’m asking if it is only my computer with this problem, or there is an incompatibility issue?
Thank you.