Cs4 garbled images with opengl

hi everyone
for some reason, if "enable opengl drawing" is enabled, whenever i open up an image(it opens up at less than 100%; i.e. 25%) the image is garbled.
If i zoom in at 100%, everything looks just fine.
What I use:
Intel P4 HT @ 3GHz
Win Vista Ultimate 32bit
2GB RAM
Ati Radeon 2600 XT with 512 MB RAM
Photoshop CS3 Retail & CS4 upgrade.
Windows, Photoshop and video drivers are updated(manually checked).
Other things i tried: changing resolutions on my CRT monitor(usually i use 1600x1200; tried 2048x1578 to no avail).
I also tried disabling the opengl drawing and everything runs normally aka the images display correctly.
In other words, i believe there's a problem with that option and display drivers.
In one topic I found something similar with the resolution to let the application decide the settings to use. I've checked for something similar in ATI's control panel, tried i think all 3d settings(enabling/disabling them and of course restarting photoshop to re-read the settings)...unfortunately i couldn't get a better result.
On the other hand, my windows installation *might* be too old at this point and a reinstallation should be in order.
Anyway, if anyone has a suggestion I might as well try it out - got nothing to lose.
Here is a sample of what's happening:
http://www.geocities.com/edi_78/test1.jpg
Thanks for reading this.

ok, here is an update:
first of all, i didn't mention where i got the latest graphics drivers: from ATI's driver download page. In other words, even though the card's model was the same as the downloaded driver, for some reason *some* features weren't enabled(i guess).
today i tried downloading the latest drivers from the card manufacturer(namely sapphiretech.com) and surprise !!! it works like a charm !

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created by John Mensinger in Illustrator - View the full discussion
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but i seem to be lost.
It is in Illustrator's Save Adobe PDF dialog, which pops up before the saved file is written.
https://forums.adobe.com/servlet/JiveServlet/downloadImage/2-6439399-644928/450-397/Untitl ed-1.jpg
Sorry i didn't mention this, but this seems to have occurred when using images and text from provided pdfs.
That's a critical fact. If you didn't do the original save, the above is moot, and it's too late to exercise any control over the save process. Someone else failed to save for editability. The only thing you can do is clean up/repair the content, (release clipping masks, rebuild rasterized elements, expand objects, etc.), and save correctly as AI. Then, if necessary, re-save as PDF with the correct settings.
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Cs4 garbled images with opengl

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