Sorry to dig out this one week thread.
I solved it.
I uninstalled all of the .net framework v4.0, then reinstalled version 4.30319 client profile + Updates.
Applyed the MS fix-it 50380.msi.
Installed stand alone from MS download center Games for Windows v220.127.116.11
Tried to login with that error, then clicked the link to resolve the error , accepted the MS new rules conditions (eula).
It brought me to an error page but i was still logged to XBox site network, then tried again to log in Games for Windows and it worked. I could access to my parameters & profil.
Then updated from Games for Windows to the new version 18.104.22.168....all working fine now.