CFP/CIS does not leave anything behind when uninstalled. Removal program is the CIS uninstaller. If a user is having problems, it is possible something weird happened that disrupted the uninstallation process. Security Center issue happens and known. Here is a workaround from a forum:
The problem may be resolved by re-starting the WMI repository:
1 - rt-click Command Prompt and select ‘Run as Administrator’. Type the following command:
If you get a message “WMI repository is consistent”, run the following command:
2 - net stop winmgmt [Click Enter]
3 - cd /d %windir%\system32\wbem [Click Enter]
4 - ren repository repository.old [Click Enter]
5 - net start winmgmt [Click Enter]
If you get a message “WMI repository is not consistent”, run the following command:
6 - winmgmt /salvagerepository
This will perform a consistency check on the WMI repository and resolve the issue.
7 - Restart your machine.
8 - If you again get the following message instead: winmgmt /salvagerepository is failed.
Ignore this message, and again run:
Reboot. Hope this helps.
There are also a couple of uninstaller related issues that worth mentioning
On a side-note it would prove useful for troubleshooting purposes to provide a separate cfpconfg.exe download.
There are also few registry leftovers. IIRC one at least pertained HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications and another HKEY_CURRENT_USER\Software\ComodoGroup. I didn’t check if recent releases remove related subkeys.