Help uninstalling Comodo Internet Security FULLY


i have installed comodo about 3-4 months ago and uninstalled it 2 months ago to put norton 360 on, norton did not see that comodo was still installed so when i wanted to install iolo pro 8 it said comodo anti-virus and firewall was still installed i want to uninstall comodo fully no traces left behind please help me, i have looked in the regedit and found NOTHINg like comodo. Help me