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Go to Control Panel -> Program and Features (Add/Remove Programs), Find comodo and uninstall it, and then reboot. Then:

Comodo Cleanup tool:

This is a batch file for removing left-over files and registry entries. It should only be used if:
  • You can't uninstall Comodo Internet Security
  • You can't install Comodo Internet Security
  • Comodo Internet Security is already uninstalled, and you want to make sure everything's gone
The batch file will remove files and registry entries associated with the following components:
  • Firewall
  • Antivirus
  • Defense+
  • Ask Toolbar, Hopsurf Toolbar, Live PC Support and SafeSurf
Windows Vista/7 users will have to run the batch file as an administrator. For Windows XP-users, make sure you're logged in on an administrator account.