I'm currently building a new gaming rig and I want to avoid having to dish out 100 dollars on a new Windows key. I currently have an old Dell Dimension 3000. It hasn't been used in a while because of how old it is but it does have a windows XP key and everything. I was wondering if there is any way I can transfer that windows software to my new gaming rig and upgrade to Windows 7. If theres a step by step process on some website that'll be awesome, thanks for all the help.