HL-DT-ST-DVD-RAM GSAH441[PROBLEMS] BURNING?

I HAVE THE ABOVE DVD-ROM ? I CANT COPY DVD’S TO DVD-R? I USED THE NERO ESSENTALS 7&DVD POWER PRODUCER SOFTWARE FROM CYBERLINK DVD SOLUTION. I ALSO TRIED NERO 6 ULTRA&VISION EXPRESS. NOW MY QUESTION IS I BEEN TRYING TO COPY A DVD I BOUGHT TO A DVD-R? WHAT CAN I BE DOING WRONG?IS THIS BURNER NOT ABLE TO COPY A DVD OR BURN A AVI FILR TO DVD-R?I FEEL THAT THIS BURNER MABY ONLY ABLE TO WRITE DATA TO DVD AND NOT RECORD AVI/MPEG OR COPY DVD’S?