ATI Radeon HD 4870's fullscreen video output is only 1024x768 resolution?

[Ant]

Hi.

On my 23" HDTV 1920x1080 monitor with ATI Radeon 4870 HD's VGA and DVI
connections on my very old Windows XP Pro SP3 computer, I cannot make
the fullscreen video overlays from video players more than 1024x768
resolution. Desktops are OK at 1920x1080. I know I can drag my video
players to the HDTV and manually fullscreen, but that is a pain because
I want to control the videos on my 1920x1080 computer monitor. Going
between windowed and fullscreen is annoying.

Is there a way to force the video driver's theater mode overlay to the
correct resolution so I can get the fullscreen video's aspect ratios
correct?

Thank you in advance. :)
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