Okay how do I explain this.... So a while back, I built my own PC and since I had no money left to buy windows, I had to download the "free" version or the trial/restricted version. That was fine but now I have bought a product key. However, I accidentally bought the Windows Home product key rather than the Pro and it now wont let me use the key to activate my windows. I have already tried going through the clean install process where you reinstall windows. I also tried renaming the thing to Home thru the settings and stuff but it didnt work either. Please let me know what else I can possibly do. I don't have another 155 bucks to spend on a different product key.