here's the specs on my laptop, sony vaio intel pentium 4, 2.8 ghz, 512 mb ddr sdram. lately, every time i try to play any media file, the audio and video are never in sync, the video is always lagging. even if i restart my computer and have no other programs running, it still lags. so far i've defragged my hd, ran a search for spyware since my roomie suggested it, and tried clearing up my hd as much as possible, yet the problem remains. any ideas?