Angels have the Phone Box
If it's a RETAIL W7 license, it retains transfer rights. I was told by MS support on multiple occasions to install W10 straightaway and use the W7 retail key to activate. Any problems, call them. If you can still get the old system to boot one last time, you can unregister Windows on the old system. To unregister a Windows key: At an Administrative Command Prompt, type: slmgr /upk
Last edited by simrick; 12 Sep 2016 at 22:05.
Reason: corrected typo in command