Microsoft knows about this error and have solved some of it but not all. In the meantime, I've found one solution that has worked for me, and another solution that others on message boards say works.
- My solution: Do a hard reboot. In other words, press and hold that power button until the computer shuts down. When I start it up again, everything is working. This is not a big shock because not all Windows resources are cleaned up on a soft reboot.
- Other solution: Do a soft or hard restart, and all the while it's booting, repeatedly press F8.
Don't shoot me. I'm only the messenger.