To uninstall TTS I think all you need to do is find the DLL file and remove it..... BUT... I would NOT do that. To reinstall it would likely require going back through the DAW installation process since it's a part of Cake in a manner of speaking.
Personally, I don't think you have a "bad" TTS install. As you dig deeper, you will find something else is at fault. What RobertB suggested about the sampling rate is very likely all or part of the problem. I never run TTS at anything other than 44.1k and it works and sounds good. try resetting the sampling rate and try it again. I have heard of problems with synths run at other than optimal sampling rates.
As a parting thought, aside from the ability of TTS to handle 16 different instruments at a time, I find that other synths have better quality sounds unless there is the need for an old school GM patch.