That should not be. Simply open the Windows Control Panel, then Programs and Features, select the program and click the uninstall button.
If for some reason your installation isn't letting you uninstall, you can just delete the program files from the Program Files directory and then clean it up with a registry cleaner.
BTW, the program could not possibly be using 4 terrabytes of space for its templates. The entire installation takes less than 700 megabytes. But you can certainly remove it if you need that space.
You could also try reinstalling PRE8. That should recreate and correct any errors in the uninstall settings.
Insanity is hereditary, you get it from your children