Hello I built a HTPC using some spare components last year it worked a treat until about a month ago. Out of the blue during video playback the video became choppy and the audio began would stutter with the choppy video. It wasn't to bad at first but now its unwatchable.system was operating on XP, Ive since upgraded to windows 7, and replaced GPU with other spare unit. It worked fine for a a few movies then previous problem returned. Im thinking it could be a bad HD or RAM?