1) Reach the Main Menu of DiRT 2 at least once after installation
2) Uninstall all Games for Windows Live programs on OS
3) Install this Games for Windows Live version on OS – Download
4) Run the XBOX app and log into your account
5) Run DiRT 2 and login with your XBOX account when prompted
Games for Windows Live – Troubleshooting / FAQ
Credit – rkatime : Original process posted in DiRT 2 Discord server.