A few days ago, I had a boot problem. In this question,
I was told it was probably a virus and to enter Safe Mode and run anti-virus and anti-malware programs. I managed to do this, and subsequent booting has been fine.
This morning, I did a few things and then had a reason to reboot, and the problem recurred. This time all of my attempts to boot using Safe Mode (F6) result in a popup window with this error:
userinit.exe Application Error
.... failed to initialize properly (0xc000012d) ....
What should I do next?