Images too dark on Samsung monitor - please help!

We've just upgraded a Samsung 21" monitor to a Samsung 30" (305T).
In just TWO applications, Photoshop CS3 and Windows Photo Gallery (Vista64), all photographic images are much too dark. Not subtly, about 3-4 f-stops too dark.
EVERY other of our applications INCLUDING ADOBE BRIDGE AND FIREWORKS, and even Photoshop itself during Save to Web, displays the photos as they should appear.
I've tried setting various profiles in Windows Color Management as the default, including the ICC profile sRGB IEC61966-2.1 (which my reading says we should be using), as well as WCS profiles sRGB virtual and scRGB virtual, and tried using no profile at all. None of these changes makes any apparent difference at all to the images we're seeing.
In Photoshop, I've tried various options too. If set to Monitor Color (Monitor RGB - * wscRGB) Photoshop then displays images as it should. However the Camera Raw display when loading Nikon images is still much too dark, and the Photoshop Save to Web images are much too light. Arrrgh!
The monitor does not include any driver software, just electronic documentation (poorly edited) which offers no advice about this. I've seen references to various Gamma utilities, but not sure that's what I need. Is it?
Any help or suggestions would be much appreciated!
TIA

Thanks Peter & Sid. I appreciate the advice, but it doesn't match our experience over 12 years of designing web applications so I'm having trouble understanding what's different, can I ask for any more advice you might have?
If we calibrate the monitor using the recommended tools, will Photoshop images look 2-3 f-stops brighter (i.e. as they should look) and will images in all other apps (which look fine now, have always looked fine) look 2-3 f-stops too bright? Or would we be changing JUST the way Photoshop sees the images?
Through probably a dozen different previous CRT and LCD monitors, we've never calibrated anything. Even on our immediately-previous Samsung 213T monitor, images appear pretty much the same in Photoshop as they do in all other places. That includes published web sites viewed with several popular browsers and viewed on literally hundreds of different systems inside and outside of our office.
The previous monitor was being used with exactly the same software and hardware as the new one. The only thing that's changed is the monitor.
Peter asks about brightness or white point luminance. I haven't used any tool to determine that. The monitor is set to 50% brightness, for whatever that's worth, but I can tell you that it is substantially BRIGHTER on white than the previous monitor. The previous Samsung monitor is being run side-by-side with the new one, and it looks quite dull and yellow beside the new one (and we thought it was a great monitor!) The new 30" Samsung has MUCH whiter whites. Does that help even a little?
Thanks for any further advice.

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