CD/DVD problems after Windows 7 upgrade

Hello,

I have a Dell Studio 540 with a DVD-RW Drive:HL-DT-ST DVD+-RW GSA-H73N ATA Device. I was running Windows Vista home premium and had no problems with my optical drive. Before upgrading my operating system to Windows 7, I check the dell web page and downloaded the drivers for my PC, for my optical drive (GSA-H73N_FW_C109.zip). After the upgrade and my new drivers, my drive no longer reads dual layer DVDs, video or data. It will read single layer DVDs, data and video.

When I load a dual layer DVD in the tray, nearly everything stops. The DVD player may start
to play the DVD but it takes minutes to play a few seconds of the movie. The windows explorer never lists the contents of the DVD. If I run the
troubleshooting aid in the control panel it waits until I eject the DVD then doesn’t find any problem.

I can read CDs but I can no longer burn one. When I try to burn a CD I get and error:

Sense:
04  ASC: 09  ASCQ: 00 (Command 35)

-------------------------------------------------------

Px.dll:
4.4.48.500

PxAFS.DLL:
4.4.48.500

pxdrv.dll:
1.2.30.0

PxMas.dll:
4.4.48.500

PxSFS.DLL:
4.4.48.500

PxWave.dll:
4.4.48.500

pxwma.dll:
1.0.0.3

I can burn a data dvd (yepee).

I did run the diagnostic test on my pc. It failed the OPU test.

I used the optical drive just days before the upgrade and now it doesn't work. I don't think it could be a hardware problem.  Any help would be appreciated.