So here is my dilemma....I have a Toshiba satellite preinstalled with windows 8, after a family member borrowed it the hard drive was DOA, nothing I could do to salvage it. So I bought a new hard drive (from Toshiba) and began to reinstall windows 8. everything went fine until I tried to activate it and my product key failed. I have the original key from the BIOS as well as an additional media & key (windows 8 pro) but neither product keys will work. I think I might have miss matched my media disks, (I have 8 various copies of windows 8). when I input either keys I am given a message stating that the key is not ment for this version please use windows 8 setup or use a windows 8 pro key. well both of these keys are windows 8 pro. I called Microsoft and they verified that both of my keys are legit, but the disk I was provided (by Microsoft) is not. they told me I have a MAK key and my version is GVLK. they told me I would have to pay $100 for a new key. is there anyway I can just get a install disk that uses MAK keys or something? and what the hell is the difference in using a mak key vs GVLK?