Hey everyone, I'm typing this on my phone so I apologize in advance for any typos. On to my question. Okay, I am currently using an Optiplex 760 SFF running Windows 7 Professional 32-bit. I use it for everything from basic office work to gaming to programming. I recently OC'd my old gpu (HD 6670) to give it some extra umph which has caused major heat issues. Last night I received an offer from a friend for a free Optiplex 755 FT. However it is running Win XP so I wanted to put Win 7 on it. I will be building a new rig later this summer which will put a dent in my budget. If I were to install Win 7 64-bit on my Optiplex 755, could I later install it on my new rig? Or would I have to buy a new copy?