System fcuked after a power cut last year, had to reinstall Win10, I gave the wizard my original disk (Win10 home) but he installed his own Win10 Pro. So far so good, only now it keeps popping up with a nag screen telling me it needs to be reactivated or will 'soon' expire.
This morning I realised that among the few bits I had lost on the last install were an image and a copy of my Win10 disk; tried to make an image and disk copy, and it does not load; this may be why he installed his own copy, though that's irrelevant because anytime I could be locked out.
Options?