try repairing the installation (reinstall UT) and then uninstalling. Else, you may want to use a 3rd party add/remove tweak program or if u know you way around, then remove the files manually and then tidy up the registry (that will probably be a pain).
If you argue with an idiot he will drag you down to his level and beat you with experience.
I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.