A few months back I discovered a rootkit on my laptop which was hiding in the winsxs folder. I don't believe that it has been removed, but I can't detect it anymore. It doesn't cause any problems on the surface, but it is indeed causing some problems. So I plan on doing a clean install of Windows 7. Before I do it I want to make sure that I will be able to activate it. I am going to use a copy of Windows 7 that has been used once already (on my desktop). I plan on activating it with the current product key that the laptop is using now. Will this work?