Ok, I haven't played this game in over a year. I've tried uninstalling it through the control panel->add/remove programs but every attempt just redirects me to installing it.
I uninstalled steam thinking that might have been preventing it but it still just tries to reinstall the game. There also is no uninstall link in the game's folder. A google search for "uninstall dark messiah" brings up nothing useful.
So, what is the trick?