How do I set up drivers for my Pioneer display

Hi, I'm running W7 ultimate 32bit on an old P4 machine with a Sapphire ATI HD4550 graphics card. It's only use is a media player / HTPC for our lounge, using an old Pioneer PDP-433MXE plasma as a display. This is a 1024x768 widescreen, pre-HD unit, without a HDMI port. Connection is via good old VGA.

I've got a couple of issues. Ideally I'd like to drive the box at it's native resolution, but if I select 1024x768 in ATI/CCC, the result is stretched 4:3, not 16:9. For the moment I'm outputing 1280x768, which is OK, but not quite as sharp as the 1024x768 stretched image. Is there anyway to set up a 16:9 version of 1024x768, or have I already done it.

Second issue is around refresh rate. My monitor is not being recognised, so on the monitor tab of the Disply advanced properties it just says "Default VGA Monitor" I've done the usual stuff of trying to update the monitor drivers from the list within Windows, I've looked for drivers on the web, but with no luck.

The problem that this is causing is that ATI/CCC won't let me select 50hz, which is what I need for nice smooth PAL DVd playback. 60hz is selectable, but only about 5% of my DVDs are NTSC.

So to cut to the chase, any ideas how I set things up to get 50hz out of my set-up? I'm happy to look at stuff like Powerstrip if I need to go that far....

Thanks

Paul