I just upgraded from Windows 7 to Windows 10 via the free download; the installation went fine and then I picked express settings during the intro screen. I was able to log in just fine but after login I see the desktop for a few seconds then a blank screen. I am able to move the mouse and get to the task manager but can not get the desktop to display. I have rebooted in safemode to disable the Nvidia GTX 580M and then restarted but this does not solve the problem. I also ran ctrl+alt+del and then ran explorer.exe with no effect; after running explorer.exe it shows up in the processes for a few seconds then goes away. I am unable to roll back to windows 7 in this state but I can get to the Control panel via the cmd command however nothing works to solve the black screen. I need some help to find a solution to this issue.