The protection installed by those guys can be easily removed from the Applications list in Windows. Simply go to Start and type Control Panel then click on the Uninstall a program. Locate the application installed and start its uninstaller. After this process, reboot the PC and download the version of Kaspersky that you want or based on your purchase and install it.
Here are the download links for Kaspersky: https://www.kaspersky.com/downloads
If you need the Internet Security, simply click it and download the trial, then use the license number to activate it.