OK, here it is... 8800GT + Athlon X2 4200+ rest of my system unimportant, except to say Vista Ultimate x64 I have been watching mkv blu ray rips for a while now (~4.4GB 720p) using H.264 and that was working fine, however, im pretty sure there is no hardware acceleration being done. so i download something that i know will tax my CPU if it is being done in software, and voila, a problem. i have a 8GB 1080p .mkv file that uses the h.264 codec, and would like to know how the hell i get my rather expensive graphics card to use the features that i bought it for, and do some goddamn hardware acceleration. I found a copy of PowerDVD6, installed it, as i read somewhere that contains video decoder (doesnt the nvidia driver have this>???) and still no luck. Powerdvd doesn't open mkv files and Zoomplayer (which is my weapon of choice btw) doesnt show up Cyberlink AVC or any other HD decoder for me to use. So... before anyone says "install and use this, etc etc" i am not going to be using any other playr except zoomplayer, i just need to know how to get my goddamn graphics card to accelerate the HD content. please help. I am not a Noob when it comes to hardware, software (mcp qualified in XP, Server 2003 and exchange) so i'm not an idiot, but tbh, don't reall care how i get it working as long as when i open these files in zoomplayer, i can watch my videos without stutter. anyone?