hey guys, yesterday i bought football manager 2010 from an exchange store, and thee was no manual with it, i installed it on the offline mode and it worked fine, i went to play on it earlier and it just won't work, the computer won't even recognize it, I was going to try and install it from steam but it won't let me uninstall it and then install it via steam and I also don't have a product key as there was no game manual, what should i do?