You can uninstall the game by entering “Add or Remove Programs” (Windows XP) or “Programs” (Windows Vista, 7, 8, & 10) in the Control Panel. In the list of available programs to uninstall, look for the entry titled RIFT and choose Uninstall. Once it has finished uninstalling, you should also make sure that the folder for the game has been deleted:
- Press the Windows key + R at the same time to bring up your run prompt.
- Type in %appdata% and click 'OK'.
- Delete your game's folder.
Removing the RIFT folder should ensure that all files associated with RIFT have been removed from your system.