annoying echo

[belikemike]

I don't know where to post this one, so here it is.
I recently bought a dvd rw and needed to install power dvd to play a dvd.
I now have a pronounced echo or reverb, whatever you may call it.
It is there no matter what I do.
The only way I can seem to get rid of it is to uninstall power dvd.
I also went into the audio config. of power dvd with no results.
I can't use nero 7 which came with the player because I get no sound at all when trying to run a dvd.
Any ideas?
Mike