OK, I cannot get my old computer to go...

not surprising. The beast has been sitting back there ignored for over a year now...

and is jealous I suppose...
Anyway, what I know:
If you have Cptn Midningt's radio mod installed, it can indeed cause a CTD if you don't have the "fix" applied. It is a date configuration thing, and someone has a post around here somewhere about fixing it. Since I can't get into my computer, I can only guess on the boat's gauges, and that would be a guess that your boat has parts that are conflicting with another submarine that has rendered in the scene.
As for the Med, try this thread:
A British Med Campaign by JapLance & sidslotm. You kind of have to dig for the download link, but bismarck1011 uploaded it to SubSim here:
Med Campaign 2.5 Release. Now, there are some issues with it, but it can be a blast...