It usually gets rid of all the remnants from hard-to-remove programs. Try using the freeware version at the bottom of the page at the link below:
Hope this helps.
windows7/64 bit firefox browser. I tried to switch from Comodo to another AV. I thought that I had uninstalled the Comodo, however, on some websites the Comodo warning box pops up. please, what do I need to do to get rid of the Comodo completely?