Michael,
 
You can always "manually" uninstall!
 
1) save all your custom contetn (Details available by Search facility)
 
2) use Windows Explorer (as an adminitrator - modify the words if you're using Win 7/Vista etc).
 
3) navigate to the folder where trs 2010 is installed.
 
4) Check the folder properties - you need to set "read only" OFF
 
5) Delete the folder.
 
6) before you re install, tidy the registry (you may need to check Microsoft instructions for this).
I use "start" -> Run ; now type "regedit" (no quotes.
In the registry editor, remove all references to Trainz.
You can use CCleaner instead - it is more automated if you are concerned about editing the Registry.
 
7) once cleaned, re-install.
 
HTH
Colin