Recently I reformatted my Toshiba C660D Hdd ,after a disastrous upgrade to W10. I could not go back to W7 despite being within the 30 days(said files were deleted),and could not gain access to "D" drive where I had both an image and factory reset, so used media recovery usb from Toshiba.
Using this I reformatted and re-installed W7 successfully, however this also changed my activation key. Do I need to change it back to original,or should I just leave it as it is.
My computer indicates that Windows 7 has activated successfully.