GFWL is dead. Download xlive.dll (Xliveless) from a mod archive. Place it in your root folder. This removes the GFWL login requirement and fixes saves.
The only downside is that you lose native Rockstar Social Club integration (no achievements), but most players consider that a small price to pay for a definitive, stable Liberty City experience. downgrade gta iv to 1070
Install the game using the default settings. Do not launch it yet. GFWL is dead
Copy your GTAIV folder to a safe location. If something breaks, you won’t have to redownload 20GB. downgrade gta iv to 1070
Start with a fresh installation of GTA IV: The Complete Edition from Steam or Rockstar.