Follow this procedure and SHCE will run (99% of the time):
Silent Hunter Commander's Edition
How to Run it with DOSBox in
Windows XP, Windows Vista, & Windows 7 ... and 8.
http://www.subsowespac.org/the-patrol-zone/silent-hunter-windows-vista-dosbox.shtml
Sorry, I didn't realize that this topic was active or I would have jumped in sooner.