Hi guys, First post here so bear with me. I have hit a real problem with my homebuilt games PC. I have installed Intervideo WinDVD and PowerDVD, and neither will play any DVDs without the video and audio being jerky - too bad to watch. I can play the same DVDs in VideoLan with no issues - the DVDs are proper shop ones, not pirates or rips or anything. My mchine is not chock full of codecs, and I have also used the Windows XP Video Decoder Check utility to set my preferred codec for Media player - I have tried the NVIDIA Video Decoder in there - again the same issue. It is almost as if there is a hardware issue, yet DMA is enabled, and VideoLan works. I have done loads of testing - changed the audio card, updated the video drivers to the latest etc. Still exactly the same jerky playback for all players - the frames are dropped and I guess I get to see a few seconds for every 10 or so. Hardware is as follows: Case - Antec P180 Videocard - ATI Radeon X1800 RAM - 2 Gig Mboard - ASUS P5B deluxe RAM - 2 Gig fast OCZ Audio - Add on card - good one I have two DVD drives in the system, and both exhibit exactly the same problem. Anyone got any ideas? Anyone got any clue?