I'd say try the whole uninstalling and reinstalling method, restart your computer while both uninstalling and reinstalling, or frankly get another tower. There is a site you can go to to see if your computer can actually run this game, sometimes it's as simple as your computer can not handle it.
Here is the link to the site, if you would like to check and see. I use it all the time, it's completely safe. It might give you a proper hand on the issue. (Unfortunately I had to remove the link as it against our forum rules; however, to those reading, if you search for the term "can you run it system requirements lab", you will be able to find the site. ~Dworgyn)
Otherwise, I would do as Brynner said and contact support. They may be able to help you.
