Ok gonna cut a long story very short ...... Brought a new tower in January this year with 8.1 on , shit happened and pointing fingers isn't going to help me now . So this is my problem , wiped or thought I did the hard drives to try and start a fresh , I've gone out and got a hard copy of Windows 8.1 .... For the product key they want because I was getting no where with the tower . Now my PC doesn't want to except the product key of the one I've got , this is after buying pro that I didn't really want to get a product key . On bios I've put it to start up on DVDs , have now spent another $40 on PC repair kit to fix additional problems . So $400 tower , $129 on pro $150 windows 8.1 $40 on repair kit plus more .......and still don't have a PC that works . What do I have to do so I can just get going because ......... Well because I need Help and thank you if you are able to give a bit of your time .