If you had no antivirus installed then its likely an infection. Clean Install Windows 7 again after preferably wiping the drive... [URL] [URL] Then use the Windows 7 license to upgrade to Windows 10: [URL]
Hi, my brother has an Optiplex 720 or 780, can't remember exactly. I just reformatted and reinstalled his Windows 7 Ultimate 32bit a week ago, and installed all the Windows Updates. Everything seemed good until yesterday when he says he went to use it and it was just a black screen with the mouse cursor. After checking the internet I found out that the explorer.exe process is missing from the Task Manager. I am able to start explorer.exe from the Task Manager myself, but how do I get Windows to do it like it should? There are no errors associated with the problem at all.  Here is what I've already done: System Restore did not fix it. It does the same thing in safe mode. Video drivers are up to.date according to Windows Update. In regedit, explorer.exe is beside Shell There was never any antiviruses installed on this install Any help would be greatly appreciated, thanks. 
Windows 7 Ultimate explorer.exe Stopped Starting Automatically