For a little while, I shared an account with a friend of mine, and he had purchased and downloaded Half Life. By sharing the account I managed to play it too until I got my own copy of it. The ***** that I am, I used his account to activate my copy, and now that I've used my product code under his name, I can't activate Half Life under my own name, even though it's my copy, and it's my product code. I am at a loss with what to do. I need to figure out a way to get my code to activate it for me, without forcing my friend to delete his copy that he paid for. Can anybody help me figure this out? Or do I have to take this up with Steam? I'm not sure how kindly they would take to the fact that I was playing Half Life for free for a few days, even though I bought my own copy meanwhile.