Dick9, at a guess, your player is packing up - more precisely, the WAV decoder maybe corrupt. What program R U using? Try re-installing it (and not running 200 other progs at the same time ;-)). Else there are loadsa WAV/MP3/OGG players to be had for free on the net ... try one of those. Try JetAudio. Or download M$'s latest Plaver v9.0.
P.S. Convert all those WAVs to MP3s - and save yourself a hellofalotta space.