When I log on my screen is black and I can only see my mouse pointer. I can press ctrl alt delete to access task manager. This is all I can do. This happend after I tried to install a theme. I had to back up a file in system32 called explorerframe.dll and replace it with one provided for the theme. Here is a link to the theme and instructions I followedhttp://sinopt.deviantart.com/art/Incomplete-VS-for-windows-8-RTM-326950280 I used the x84 instructions.