Please contact firstname.lastname@example.org about this.
Couldnt someone just explain what the heck this garbage is. Who sells a game that wont let you uninstall
I had a good chuckle.
Anyway, deleting the files out of their respective folders manually is a fairly bad solution; this will not remove the item from the Add/Remove List as the registry entry for your program is still present. You've removed the files from your Harddrive, so now you'll need to either reinstall the game and then uninstall it, however it still might not work. So, you'll need to manually remove them. Go here and here, follow those articles to manually remove the registry entries.
Best of luck!