I have an Aspire 5253 laptop that works as my Web Server. I rarely use it for anything else. I do, however, want to use it to play videos. It's having problems playing some HD videos that I've ripped from my Bluray movie collection. I've converted some blurays to MKV files. I've tried playing them on this laptop and noticed that the video was jittery. I've installed Shark 007 codecs and VLC media player, but no luck. I can play videos of lesser size, ie M4V with no problem. It doesn't have a bluray drive, so I can't try playing a bluray disc. Any help is appreciated!