I wanted to get the Pro version of windows 10; however, i do not have the Pro verison of windows 8.1. I made the mistake of googling a key to upgrade to windows 8.1 Pro. I found one, and my computer is now windows 8.1 Pro, not activated. I want to know if there is anyway to undo this mistake. If so, id greatly like to know. Is there anyway of getting back my old version?(My laptop came pre-installed with windows 8.1)