You are three minutes away from tactical multiplayer glory. Do this checklist in order:
Once connected, join the "UIB" (United Insurgency Battlegrounds) or "=SOF=" servers. The community is smaller than 2006, but the tactics are sharper. ghost recon advanced warfighter multiplayer id key fixed top
Sometimes, the native server browser is broken forever. GameRanger is a 3rd-party client that emulates LAN play over the internet, bypassing the CD key check entirely. You are three minutes away from tactical multiplayer glory
If you have an old CD-ROM key and a Steam account: Sometimes, the native server browser is broken forever
If deleting localdata.sav fails, the key is stuck in your Windows Registry.
Warning: Backup your registry before doing this.
CDKey or ProductKey.This is where the "Fixed ID Key" solution encounters its only real hurdle. While the fix allows you to play, it cannot manufacture players out of thin air.