WMP 11 and Real Player won't play sound with the DVD playback on my friends computer. I've done tons of troubleshooting and reboots. I've adjusted the sound drivers, and even redownloaded it direct from the manufacturer. It only happens when I play DVD's. CD's play fine. The system sounds play perfectly, so I know its a problem with the two programs. I'm at my wits end on this... btw... the computer is a Dell Inspiron 9300, runs Windows XP 2000 Professional, Intel Centrino Processor any ideas?