I just lost all my PC saves.
Basically, GFWL won't allow me to sign in on my PC at all. I had to reinstall GFWL and several .dll files to allow me to sign in.
Well, after redownloading GFWL, it now states I am not using the same username to connect to GFWL that I originally used. It errored out and stated that my "save files have been corrupted". It signed in automatically and asked for an update, then failed *again*.
Now when I start Dark Souls, my saves are all gone. Screw that.
I also can't log into any of my other GFWL games, including Batman Arkham City and Fable 3.