In order to be able to watch DVDs on my netbook, I recently bought an external CD/DVD drive. It plays my CDs just fine, but won't play DVDs. I get this message: "Windows Media Player cannot play the DVD because a compatible DVD decoder is not installed on your computer." The material that came with my DVD drive tells me that it doesn't include a decoder, because many computers already have one. There seem to be a lot of different options available, and I haven't the first idea which ones might be promising. Can anyone give me an idea of exactly what I'm looking for and where I can find it? Thanks.