I have a Toshiba A215-S5839. It has an AMD Dual Core Processor and 2 gig of ram. Installed in the laptop when I purchased it was a Matshita DVD-RAM UJ-850S. I have always had some problems with the drive and would often have to reinstall the driver. Reinstalling has stopped working. Now it will not read data dvd or cd's at all. Comercial Video DVD's play, but all that can be see is moving blocks. I tried your registry trick and it crashed my computer. I was worried I wouldn't be able to get it back. All the rest of my drivers have been updated and seem to be working properly. I have all the proper codecs and my DVD drive is set for the proper DVD region. I'm at a loss. Please help...