Hi ankinferno, I think Fox2232 has a point. I run Vista and own a non-overclocked HD 4850, applied your performance patch (I checked that every file from your patch was in my %SYSTEMROOT%\System32, and rebooted). Subsequently, Windows Media Player refused to play any video file (it plays most formats, but as if they were audio only), also I cannot obtain WEI (error when encoding the test video winsat.wmv). Everything went back to normal after I restored the files. Too bad you don't have the 4xxx card at your disposal, because I also think the legacy patch needs some reworking. Good luck!