Is there a way to uninstall Comodo Internet Security while keeping all my user data and settings, for in case I want to install it again?
You can export your Configuration, prior to uninstalling, which will keep your current Settings and Rules: Config Export
Please note:
Import the exported configuration file only on the same computer. The configuration file namely contains computer specific settings added to the default configuration files which were created during CIS installation. These computer specific settings may lead to issues on an other computer when the configuration file is imported in CIS on that other computer.