Hello. I have a 2012 Dell Optiplex with Win 7 Ultimate loaded at time of purchase. About 6 weeks ago I upgraded to Win 10 Pro x64 by download and install from the Microsoft site. All was fine until this morning. For reasons I can't determine the system isn't accepting my password to logon. I've tried every password I can think of but nothing works.
I would like to try re-installing Win 10 but getting jammed at the boot up process. The system doesn't recognize the bootable Win 10 ISO file I got from Microsoft. I tried it on a DVD and a thumb drive, but neither worked. I can get into the BIOS settings but no matter how I prioritize the sequence of boot sources it still doesn't work
Is there something I'm missing? Thanks.