This started recently with my PC, any downloaded AVI file plays, but the video is slow while the audio is OK. I burnt the same AVI on a CD-R and tried playback on another of my systems, and it played fine. The problem just sems to be on this one computer. I just today reformatted and set it all back up from scratch, including the most recent drivers (Video is ATI Radeon X300 PCIe and Audio is Realtek High Def Audio)checked for firmware updates for both DVD burners and everything is up to date. Installed AnyDVD and Nero Ultra 7 and I still have the same problem. Any Ideas out there? My ystem is a P4 3ghz with 3gb PC2700, 2 LiteOn LH20A1H DVD burners, 2 WD Raptor 74 gb HD's, Win XP Pro. I figured I'd reformat just to be on the safe side of things (being a computer tech and having a smoking fast HD like the raptor doesn't hurt either...I'm used to formatting and redoing things on a regular basis), so...any help or ideas would be greatly apreciated. Thanks.