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1) Open Programs and Features in Control Panel. This can be done by pressing Windows Key + W, then typing Programs and Features and hitting Return.
2) Look for "Microsoft Games for Windows Marketplace" and "Microsoft Games for Windows - LIVE Redistributable." Right click each one, one at a time and uninstall both of them.
2a) Restart Windows.
3) REINSTALL the Xbox.com version of GFWL. Why? I don't know other than it works. It has something to do with the new Xbox One, I imagine. Whatever the case, I was upset. But doing this fixed GFWL games on Windows 8. I currently play Dark Souls: Prepare to Die Edition and Street Fighter X Tekken on Windows 8 and both work fine with the Xbox version of GFWL.
Here ya go: http://www.xbox.com/en-US/live/pc/downloadclient
And if you aren't an en-US, just switch to your locale.