SONY dw-q28A Problem Shuts down system

Can anyone help me everytime i try to copy a dvd as soon as i enter the disc into the drive the computer shuts down i have an external dwq28a and are running windows XP, please can some one help at all? i have looked everywhere for drivers for this but have had no look i am not technical at all it is pluged into my usb 2 port thanks mattandlise@hotmail.com