I know it sounds really stupid, but I bought Windows 8.1 with my first build and I absolutely hate it. Maybe one day I'll grow to love it again, but for now I'd just rather go back to using Windows 7. I have my COA's, so I'm hoping to uninstall Windows 8.1 and put 7 back on. My real question is, would Microsoft allow me to re-use my activation code for Windows 8.1 after I've already used it with the same machine?