Ghost Recon Advanced Warfighter?

I got Ghost Recon Advanced Warfighter for the Pc, and it works fine on campaign but when I go to multiplayer and I put in my gamespy username and password it won't sign me in!!

I have everything I have the Multiplayer Id and the disk it won't let me =[

I suggest signing up for another Gamespy account. If that doesn't work try to reinstall.