I usually reformat every 2-3 months because the computer either gets slow or I end up having a spyware/virus on my computer. I am a mmorpg gamer and some third party applications usually messes up my computer. My concern is that whenever I format, i need to enter a product key to activate windows. I have only formatted once so far but lets say i format again, will it give problems that the key is already in use or will it be activated once again? Also, is there a limit on how many times you can format and use the key? I also have a dell desktop but whenever i format that, it never asks for product key. Is there a way to embed the key to the motherboard?