[LeifH12345]

I had a similar problem when I first got my current computer. All the audio played, any format would be slowed down and choppy/skippy/clicky. Also for a while after DVD's played in any program would have the same effect. I'm convinced it was a virus as at first it only lasted a day, and then when it started working again, it went to shit. I got a new anti-virus (AVG-Free) and haven't had the problem since.

So, I'm no expert, but I would try re-formatting and/or changing your virus protection. Again, just a suggestion as it could be a completely different problem.