Thanks Mac for your advice. I think I have found the solution to the problem as I posted the same problem on the biab forum as well, so forgive the copy and paste from it.

When I switch on my fast track, it was automatically setting itself up as the default playback device in sound in control panel and knocking out the speakers and the windows media sound, but once the fast track is off it reverts to speakers being default. Windows media player always works perfectly when the fast track is off.

Sometime in the past I must have set the fast track as the default in sound in control panel when it was switched on which caused the problem, and it was keeping those settings once it was switched on again.

I have set the speakers as default again and the fast track seems to be keeping that setting as now whether its switched on or off.

Everything seems to be playing fine now, thanks Mac for the help.

Axey