My new quad core that I built has developed a strange symptom. It started after a power cut that shut the computer down improperly while I was out.

I now have shedloads of reverb on audio playback from the internet. It makes speech almost unintelligible and muddles music up a lot. I also ahve had the stereo image move over to the right a lot.

My sound is onboard AC97 - I'm hunting for a good PCIE audio card cheap - and basically there is F*** all to adjust in that.

Where has this dratted reverb come from and how do I make it go away?

Other computers on my network don't do it so it has to be machine specific.