1. Click on Start->Settings->Control Panel->Add or Remove Programs 
2. Remove everything with name "Microsoft Games for Windows" (blue icon) and Rockstar Games Social Club 
3. Go to the GTAIV folder and delete xlive.dll 
4. Install and Launch "Rockstar Games Social Club" here 
5. There is "Latest Rockstar Social Club News" on the right 
6. Download "Games for Windows LIVE" by clicking on the picture with this inscription or here 7. Install (that's all)
OR:
- Update to the newest NVIDIA/ATI driver - Update to the most recent drivers for your motherboard chipset - Update to Microsoft .NET Framework 3.5 Service Pack 1 here - Restart your computer
If it still doesn't work try the following: - Reinstall GTA IV
OR:
WS10 == Wrong exe/crack Install again newest patch.