Here's what I would like to do. I have a laptop that had Windows 2000 professional on it. I purchased an upgrade license for Windows XP professional, installed it, and have been using it for about a month. I want to put Windows 2000 back on my laptop, sell it on e-bay. Next I want to install XP professional on my desktop which is currently running Windows 2000 pro. Since my XP license has already been activated on the laptop will the Bill Gates police come and take my PC away? Do I have to call Microsoft to transfer the license, get a note from Bill, God? Has anyone here ever done this?