Welcome to the forums MrsLaVallie.
Lets take this one step at a time and see what works. We need to determine if the dvds that you have bought are actually recognized by the drive. So, download a free burning program called ImgBurn. www.imgburn.com
Install it, careful not to install any extra programs that might be offered. ImgBurn is a superb burning program, but the installation often times will try give you something else with it.
Start ImgBurn and click on Write Files/Folders to Disc. This brings up the main window in ImgBurn. Click on Output at the top of the window and make certain that the output is to Device. Your drive should show up in the Destination line now.
We're just trying to test for compatibility, so put in a dvd, then click on File, then Browse for a source file. Pick a file that is small enough to fit onto the disc and use it for this test. Click on the Device tab on the right and you should be able to see some information about the blank dvd you have inserted in the drive. If ImgBurn can recognize the disc and gives you options on burning speed you can use with it, then the dvd should be compatible. You can click the big disc icon at the bottom of the main window if you want to go ahead and do a test burn.
Now back to your original intent. PMB is picture motion browser? Is it possible to transfer the video to the hard drive and burn with ImgBurn instead?