Are copies of Shadowrun permanently tied to a single Windows Live ID

Its like using the same account on two xbox. You can't do it.

Now there are obvious reasons why Microsoft doesn't want you to be able to use the same account more than once (which are compounded by DLC), but the bottom line is: you can only be logged into the same account in one location at a time.

Now you might want to consider the new Family Pack, which is coming soon. Or streaming your Netflix to a PC.

The short answer though, is: No

I had a similar issue with Fallout 3. What I ended up doing was installing GFWL on the fresh version of Windows, looked for the newly created save game folder, and copied my backups directly in there (the folder that was created...I didn't overwrite them).

My memory is a bit hazy at this point because I started freaking out that I'd lost my save games, but I'm pretty sure that something was named slightly differently with my new profile.

Maybe what you should do, is start up a round of SF4 and save your game. Then look to see where the new save game is located and overwrite it with your pre-existing versions?