I have no idea why the Silent Hunter sims are not working on my setup but I just can't get them to run. I haven't given up and will be getting a new solid state drive in a couple of weeks so when that gets here i will try to install on a freshly formatted drive.
In the meantime I picked up Wargame Airland Battle from Steam. If Battlefront used the same control system on there Combat Missions series of games they would be far better for it. The system is very intuitive. I've had a great time in single player mode so far. I have to admit its a bit of a click fest but the hardware on offer is fantastic . I love the Cold War era of combat. This is a fantastically refreshing game and has the best interface of a RTS I have ever played. Well worth a look in.