You first need to download a small utility called Everest Home Edition, which you can get from here:
http://www.majorgeeks.com/download4181.html
Everest does not install anything on your computer, it will extract to a folder of your choice and you run it from there by double clicking on the file called Everest.exe
Run it and it will give you details about your computer, including the specific DVD drive fitted. I expect it will be a Pioneer but you need to know the model number.
Then do a Google search for the manufacturer (or post the details here and I will find the driver), then there will be a search facility on the site to find the download.