Just wondering if anyone has experienced something similar and may be able to help? I have used PowerDVD 9 for ages and have had no problems playing DVDs or BluRays. Recently I bought Ironman 2 and PowerDVD told me I have to ugrade in-order to play it. So I did upgrade to PowerDVD 11. Now all DVDs and Blurays play back really choppy! I have a E2200 with 2Gb ram and Radeon HD 5450. Any other HD files I play even at 1080p are fine. I updated my ATI drivers to the latest. I tried reinstalling PowerDVD 9, but got the same problem. I also tried installing CCP codecs and updating Direct X. I also tried AnyDVD HD, as PowerDVD bluray playback detector said that my TV wasn't HDPC complient. I tried changing my Page file size which seemed to help but only for a few seconds after which it became choppy again. I have enabled and disabled GPU accelaration and switched my drive to and from PIO and DMA. Also I disabled anti-virus. I have tried multiple BluRays and DVDs with no luck. I even tried WinDVD 10 which gave me the same results. I just have no idea what has happened!! Can anyone help out? Thanks in advance!!