Which version of WMP are you using. If it is version 10 that might be your problem. I use nero ultra. When I first purchased the program it had problems with WMP 10.

I'm not sure if they have resolved this problem yet. But I uninstalled WMP 10 and reinstalled WMP 9 and my problems went away.

I also went to automatic updates website and hid WMP 10 so it wouldn't do an autoupdate to WMP 10 again.