Hi, I posted this same question 2 days ago and no one responded but here are some things that worked for me:
First, did you download all of the windows updates? I found that the one for IE8 with the last digits 364 is the one causing the problem for me. Uninstall it from safe mode and restart. That fixed it for me.
But if that does not work, from the black screen, control-alt-delete, go to task manager, manually run explorer.exe. Your desktop should appear.
Good luck!