sorry, I didn't post it, but I solved the problem.
What bsplayer, mpc and wmp64 have in common is that they all use windows' dshow filter (or whatever is installed) for decoding, winamp has its own decoder.
It seems that the there were versions of iviaudio.ax (for AC3 decoding) which could decode mp3 very badly. wmp8 and higher and winamp have their own filters, t´hus there were no noises.
I just installed a new AC3 package from sourceforge and now everything is fine :)
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