I got an .mkv file so I found the Matroska container installation (http://ld-anime.faireal.net/guide/mkv-eng). I installed the file and the .mkv file successfully played in my Windows Media Player, but it was choppy. I found a "Tweak" option in the Matroska file menu, so I clicked on it. My PC basically started churning away but al the apps were stuck in a hung state. After several minutes of no response, I rebooted the PC. The PC wouldn't boot up after that!!! I can't even get into the BIOS menu. Arrrrgggghhh!!! Has anyone experienced anything like this? Got any suggestions? Thanks!