Hello, I have an Acer that had Microsoft home Premium on it but no disks. I had to re install so I used the key that is on the sticker under the laptop but after installation I got the message that it wasn't the right key. So i followed the prompts that led me to a phone call to activate by giving a bunch of numbers that were sent to Microsoft and it still says invalid key. Their is no OEM key that I can find and I cant get recovery to come up. I have a copy of a Win 7 Home that I used to install but its not the original. Is their a way to use the original key somehow?