Blue screen on computer?

My son wanted to get on the desktop and when I said no!
He started hitting keys on the keyboard and now I have a all blue screen and no words at all.

Space Space2011-08-21T14:21:43Z

1. Hold down the power button for 5-10 seconds.
2. Press the power button.
3. Start Windows normally.
If that does not fix the problem, try getting another keyboard.
If none of those work, do the following:
The following directions are to be performed from when your computer is off.
1. Press the power button on your computer.
2. Immediately after the computer is on, repeatedly press F12, until you are in the Boot Menu.
2a. If the computer boots as normal, turn off the computer, and repeat steps 1-2, replacing the action of pressing F12 with pressing another F-key. You can also attempt using ESC or DEL/Delete.
3. Either way, you should be in the Boot Menu. Press the button next to your primary CD-ROM.
4. Place an operating system installation disk on the CD-ROM tray.
5. Press the button next to your primary CD-ROM.
6. Use the arrow keys to highlight the option for booting from your CD-ROM.
7. Press Enter.
8. Press a key.
9. Follow the directions to install the operating system.
If that does not work, make your son start saving up some money to purchase another computer.

Watsfordinnr2011-08-21T14:18:46Z

try a cold boot. basically hold the on/off button for 5 seconds, wait about 30 more, then turn it back on again