Hello everyone! I have some movies that are in .mkv format and I cannot get them to play correctly. I have downloaded many different codecs and players. I have Media Player Classic, Zoom Player, and VLC Media Player. Media Player Classic starts off doing pretty well and then the audio gets way out of sync and then after a few more minutes the video and audio will both start to get really choppy and cut up. In Windows Media Player I get the best results with FFDShow active but after about 3 minutes it just slows down and you can't watch it and then after the the whole computer seems to respond sluggishly for about 5 minutes or so. Zoom player starts off looking good but if you move the player or click anything it will lock up and if it doesn't lock up the audio will be terribly behind. I am having these problems with all of the .mkv files I have and I am pretty sure it has nothing to do with the files theirself. VLC has the worst problem with playing them, the audio cuts a lot, the video can't even be watched it stays pixelated and my cpu usage hits like 100% or near it. I have an HP dv2845se running Windows Vista Home Premium 64-bit. AMD Turion 64 X2 2100Mhz Dual Core. 4.0GB Physical Memory. 8.06 GB Virtual Memory. 250 GB Hard Drive. 7200 rpm. nVIDIA MCP67M GeForce 7150M nForce 630M. If you need more info just let me know. I just got this laptop in August of 2008. I am open to any suggestions! Thank you. Garry.