I bought a new motherboard the other day and installed windows 7. Taking up one of my uses of windows (I thinks this is how it works). However, the motherboard is faulty, and therefore I'm waiting for a replacement from amazon, but the board is not in stock, so I'm not sure when I'll get my replacement. Therefore, I want to reinstall my old motherboard so I can access my computer until I get a replacement. However, I'm worried if I reinstall windows on my old board it will use up my last use of the key, which I'm going to need when I get my replacement. I could be completely wrong about this, but I thought just to make sure I would try and get some help online.