First thing I would try doing is uninstalling all of your codecs (including MPC) so you are left with your bog standard WMP. Then try installing the Combined Community Codec Pack... http://www.cccp-project.net/ Then under the MPC options make sure VMR9 Renderless is selected if you are using Windows XP or EVR if you are using Vista or 7. As for the Internal Filters I will send you a message later with a screenshot of the correct settings (as I am at work but I leave soon). As with regards to your drivers...Uninstall 10.8, reboot, run Driver Sweeper, reboot and install Catalyst 10.9 and reboot. It could be something as simple as the driver...IIRC I couldn't run two monitors on 10.8 because some numpty at ATI programmed the tele to run at the wrong refresh rate.