Can't Get 16 x 9 on HDMI HDTV with NVIDIA

I have an HP Pavilion M9040n with Vista Media Center and NVidia Ge Force 8400 GS. I have a regular PC monitor connected and an HDTV connected via HDMI.

Suddenly, HD video clips in 16 x 9 play at 4 x 3 on the TV. The image on the screen has black bars on each side. I have tried multiple resolutions and everything else I can find from the NVidia controls as well as what I find by right clicking on the desktop and choosing Personalize.

Some resolutions make the image smaller so there is a blue frame around the image + the black bars.

I tried installing the latest driver from NVidia, uninstalling the driver and using system restore to go back to when it was working properly.

tried it many times, but this time it worked! Thanks!