Windows 7: After start up Windows screen is blank and blue

This morning when I turned on the computer after loading the screen is blank and blue.
Yesterday everything was fine, but today that is not.
Nothing is working properly. First, the only thing is I can run Task Manager. From there I see that explorer.exe is running. There are no desktop icons, no taskbar doesn't work right mouse button also Windows button on the keyboard. Nothing works. I have only one computer, so I started a browser in Task Manager. Since windows installed a few days ago I have not done a restart point, so I can't go back to the previous system state. The situation is the same in Safe Mode. I tried to repair with the disc, but without success. Scanned with a LiveCD of Avira, Kaspersky, BitDefender, the computer is clean. Please, help me if you can and excuse me for my English.
Thank you.

This is a picture of the desktop
http://kachi-snimka.info/thumbs/arx1274005520a.jpg

If you've installed any programs since installation then there is almost certainly going to be a restore point (unless you told it to stop making restore points).

If you haven't added any programs to the OS is there much to be lost from a new clean install?

I would try the repair install again and see if anything changes this time round but it seams like a clean install is the only solution.

Oli