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Yes, get rid of Comodo AV. You can not run two AVs. Also, there are several posts in Comodo Forums from members running XP Spk3 who claim that CIS 5.3 had crashed their system, but not real answer from Comodo devs if they are investigating these cases. Others are doing OK like
Speedy. My case, I am back to Cfw 3.14. I can not make CIS 5 to run well in my sys in Proactive Security. It runs OK in Firewall Security, but that set does not give you all the HIPS protection.
Exclude Comodo in Avast Behavioral Shield and File system shield. Also make it a trusted program for Avast Sandbox.
Avastsvc.exe should be set as " Installer/Updater " and avast.setup (this is hard to find) should be in your trusted files.
Good luck.