Hi, When using sites like BBC Iplayer or youtube the sound plays fine but the video freezes for a second every few seconds, I also see the same issue in VLC, Windows media seems fine. Also my PC Beeps repetitively when i exit Firefox after having choppy playback, this last for a minute or so, this doesn't happen with vlc. I have tried updating my nvidea drivers and also direct X but this has made no difference. I use the latest version of Firefox but have tried internet explorer and it has the same issues. My PC is brand new from Dell, although I re-installed everything from a fresh copy of windows seven as soon as i got it Specs are Intel (R) Core(TM)2 Quad Q8300 @ 2.5GHz 2.5GHz RAM - 6 GB Windows 64 Bit I have 1 terabyte of space split over 2 actual drives that are partitioned into 4 drives, my C drive has 84 GB spare. Nvidea GeForce GT220 graphics card Does anyone have any ideas?