Steam Multiplayer Issue - Warhammer 40k Dawn of War?

I've recently bought Warhammer 40k: Dawn of War on Steam (Dark Crusade and Winter Assault if it matters). However when I go to sign up for a Gamespy account, the game will not let me - it says that I require a CD in the drive. Now obviously, because I bought the game off of steam I don't have a CD. Are Steam users prevented from playing in online multiplayer?

MY mate also had a simailr problem.

If you contact Steam they will be abel to tell you what to do( i belive it involves twekaing hte registry a bit)