Hm. It seems that the computer may be locking-up while trying to find a previous path you may have used. Did you once link to a location on your network, or a location that no longer exists?

You may want to see if launching the software through the 'run' command works - using the command line you can specify what input file you want to launch.
http://www.empirisoft.com/directrt/h...and_prompt.htm

If the above doesn't work, you may want to try uninstalling, and then reinstalling.