As in, I went through days of tedium doing a malware cleanup on an old desktop, then I started the the steps to optimize the thing as found in the How to Optimize Windows 10 tutorial. I unchecked the unnecessary features and did the reboot, and since the reboot I'm getting a blue screen. It does a partial automatic repair at boot, then kicks to a diagnostic screen. It will not restore to the restore point, and nothing else in advanced options has worked so far. I have not tried going to a dos prompt, but am wondering is there anything I might run from there that will get it to reboot to Windows? Suggestions?