Short answer: Yes, they should work with Win 7. There are just some things that might need a little tweaking in order to run these games smoothly.
In order to run Fleet Command smoothly, you might want to try a glide wrapper because even the Naval Combat Pack version doesn't seem to like Direct3D that much and you might get terribly slow graphics. I'm using nglide, and it runs perfectly fine now.
In case you're not using an American keyboard, some keyboard commands might be different than what the manual / in-game help screen tells you. Check out the Fleet Command Project website and download their manual if that's the case.
As to 688(I), I have both an orginial copy and the one that came with NCP. The original works fine, but I have no sound in the NCP version, although there is a workaround somewhere here on the forum.
I haven't had any problems with Sub Command.
Hope that helps
