I don’t know if this is a Vista x64 issue, but when I am watching a DVD on the laptop the movie playback is quite jerky and as a result very irritating. I have tried both Media Player and Media Center and unfortunately get the same result. Interestingly though, a few weeks ago, between the two (Media Player and Media Center), one of them was jerky but the other was smooth (I forget which was which), but now both are the same. The movie itself plays fine, it just seems to buffer up every 2 seconds (sort of in a loop) and then quickly catch up. I tried all combination but no luck. The only thing I could think of that has changed since the last time and this was that I added the mp4 codecs. All this means is, in the end it gives you a headache. .