Could be a driver issue (which you'll have to weed out on your own), but it could also be a hardware issue. I've seen systems restart when they hit a bad memory block in a stick of RAM.... Typically RAM modules in PCs are not ECC RAM (error checking), so when they have a problem reading/writing to a block, they cause all kinds of havoc to the OS. You could also have a problem with your hard drive/file system to cause similar issues. When you play Netflix movies, the flash player uses your available RAM and page file (hard drive) to buffer the stream. Just like having a bad block in your RAM, you could have a bad section of your file system that's causing problems. Try running chkdisk and defragment your drive for kicks before going to bed just to rule half of those possibilities out. There are diagnostic RAM utilities out there that will test your memory...Dell used to have some, but I don't know what they offer for PCs...I'm more of a server guy these days and use throw-away hardware...when it breaks (rarely happens), I don't waste my time...I replace it. It sounds wasteful, but it gives me a reason to buy something new every 3-4 years.