Possibly the gmap folder is corrupt [it shouldn't crash MapSource like that]. Try running [Only registered and activated users can see links. ] in the gmap folder. If you still have the same problems and are using the patched versions of MS/BC/MI then i suggest downloading again, preferably from a different source and preferably a locked version that you can unlock yourself with unlock mapset.exe from that link.

PS: Unlocked status means that the map is unlocked for use in the software only. For it to be 'fully unlocked' its status should be 'Not lockable'. Best to use only MI for transferring modern NT maps to a unit, MS can't deal with them properly to create the image.