Reinstall windows

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I WAS WONDERING HOW I COULD REINSTALL WINDOWS ON MY DEVICE AS I CANT SWITCH IT ON. IN FACT I CAN SWITCH IT ON BUT WHEN IT TRYIES TO ENTER THE WINDOWS SHOWS A WHITE SCREEN ONLY AND DOESNT START PROPERLY AND THEN A BLACK SCREEN AGAIN.
PLEASE TELL ME WHAT TO DO.

For god sakes, stop typing in capitals.

Hold down the Comm+Voice buttons while pressing the reset button. Then release the reset button. Keep your fingers on the Comm+Voice button until it says "Push send to format"... then press the bottom left button on the front of the device (i.e. the green telephone button). It will say FAT format complete then it will reboot. Wait about 2 minutes for it to repopulate the device's ROM.

There, you have a factory-fresh device.