Yup, Gopher is correct, as I did a full uninstall of the game (not GFWL) 2 days ago. I had no frigging choice, as the .exe crashed immediately all the time. All normal recovery methods, and all my backups couldn't fix it.
I reinstalled, and applied the patches manually rather than using GFWL to patch the game. After reinstalling and patching, I ran the game (you have no choice with the patch installers, they auto-run the game) creating a profile (a driver) with the same name as before, then shut the game down. At this stage I copied back all my backup files to the MyDocuments/MyGames folder.