I had some issues with getting an Office 2013 Professional Plus 2013 trial when I first installed it from TechNet, and I had to reinstall it. When I tried to activate it after reinstalling, I got the error Error 25004. The product key you entered cannot be used on this machine. This is most likely due to previous Office 2010 trials being installed.
I didn't use up my trial period, and I only had it running for about a day before uninstalling it. I've tried everything, removing registry keys (HKLM and HKCU\Software\Microsoft\Office), removing files from Program Files, AppData, and ProgramData, and even got rid of some files from C:\Program Files\Common Files (Office, OfficeSoftwareProtectionService, Source Engine).
I really don't want to have to format my hard drive and reinstall Windows.