well, this is my story. I got halflife 2 and counterstrike source as a present from my cousin. It was a DVD. I installed it and everything went well, but then it said i had to connect to steam and register. I put in my serial number, and steam said it was invalid......WTF? My cousin bought this game unopened an the key doesn't even work...why? Is there a way to fix this. I don't mean to resort to piracy, but i have a legitimate copy of this game, and i have the license to play it, so can i contact steam again or do i have to use a crack? also, I will even post a video of my GENUINE DVD game for those of you who don't believe me.