I upgraded to Windows 10 recently and just realized that I was in guest mode only.
I can't install anything (cmd in admin mode), downgrade to Windows 7, restore, or do anything.
There is no Administrator account, only my local guest account, and everytime I try something, it shows me the box where I need to click on YES, but it is greyed out.
I restarted in Safe mode, as advised, but it always asks me to login to my local account, no other choice. And then, I am back in guest account in Safe mode. I tried all cmd command tricks, but always get stuck in Error 5, which means no administrator privileges.
So I am not even able to downgrade, for the same reasons.
Please help, this is driving me crazy!