lagg in video after couple of minutes

[neogoa]

hi,

i've been having some problems playing all kinds of video streams.
here is what hapens: i open a video file in any program ( have used WMP10 and 9, bsplayer, zoomplayer,...) and it loads fine and plays ok for about 5 to 10 minutes then the video starts lagging and the audio keeps on going on. no program recovers from the lag. i've installed already a couple of codecs (such as ace divx 5 and some other packs) and removed them again reinstalled everything, nothing helps...
I have a nvidia gforce 4 488 go card

Any advise would be very welcome

thanks in advance

[setarip]

Are you playing files from your hard drive or burned media?

[neogoa]

burned media. i use the latest nero burning rom and my burner is a brand new sony 16x dvd writer so i don't think the problem lies with the burning software nor the burning hardware, perhaps it could be my cd-r is this a possibility? They came quite cheap so the quality can't be that good right or doesn't this mather? but i'm trying the media on my harddisk now i'll keep and i'll see if there's a lag. I'll keep you up to date, thanks for the advice.