Topic: Fireface800 can't playback anything , help!

Hi guys
  My fireface 800 used to work great, but recently when playback audio, it sounds like crap, noises, jammed, slower,  for unknown reason(I believe  I havn't changed anyting).  It is playing back the audio I select , but in a distorion , slower, unusual sound. I re-install my system xp32 bit, and it' sounds good again ,but after using for like half a month, the problem remains. .. I took it to another computer of mine, same problem...
Please help!
Thank you!