Try uninstalling as normal and restarting. Then run the old uninstaller tool:
http://download.comodo.com/cis/download/installs/ciscleanuptool/CisCleanupTool_x86_3.1.0.45.exe
http://download.comodo.com/cis/download/installs/ciscleanuptool/CisCleanupTool_x64_3.1.0.45.exe
and follow my guide to removing CIS leftover drivers: Remove CIS Files after uninstall and manually remove the installer startup entry:
Registry:
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
If there’s still and issue try uninstalling in safe mode.