I assume you are using Windows Vista? If you have downloaded the latest version DriveHQ FileManager or DriveHQ Online Backup, they are fully compatible with Vista.
Also, all DriveHQ software can be uninstalled simply by running the installer again. You can also uninstall it from Control Panel --> Add/Remove Programs.
From what you described, it seems you either didn't install a right version, or didn't install / unistall correctly. Please make sure what you installed is indeed DriveHQ software.