I've seen this, it had something to do with that soundchip only playing back 48Khz samples, it won't resample to 128 or higher so it just plays back too fast.
If it is integrated chipset audio (not a separate card) this is actually common, let me dig!
The latest driver I found was A3.64 available here: http://www.realtek.com.tw/downloads/dlac97-2.aspx?lineid=5&famid=12&series=8&Software=True#8Windows
I also found a reply in another forum that mentions adding a line to the rc.local file to change the default sampling frequency but no specifics offered. You could play with a copy of the file if you have it.
IN all reality though, this soundchipset will not resample properly by design. I would invest in a decent card if you use it often.
ONE LAST NOTE: If this is JUST when using Windows Media PLayer, you can swith from Wave out to Direct Sound or vice versa, as that is common for glitchy WMP playback, this site has been helpful (under the Audio section). http://www.zachd.com/pss/pss.html#audio
Without specifics, that's all I can offer, best of luck.
OM