Eyedropper tool isn't working correctly in Levels, Curves adjustments

I have installed PS CS 5 Extended on a new computer running Vista Home Premium.  No other version of Photoshop has ever been installed on this system.
The problem that I am encountering is the eyedropper tools in both the curves, and levels adjustment doesn’t work.  The actual sliders seem to work appropriately, but clicking an eyedropper and then clicking a spot on the photo has no effect at all on the image.
I do not encounter this problem when I run the 64 Bit version of the program.  It only occurs in the standard version of CS5, which I need to continue to use due to plug-in incompatibility with the 64 bit version.
I’ve checked the obvious, and ensured that the “preview” box is checked, and  that I have the correct layer selected!  
Any help or suggestions would be greatly appreciated!!!!!

Not sure if it could be coming into play here, but the sample size for the Eyedropper Tool (proper) affects the use of the Eyedropper in other dialogs.
Do this:
1.  Click the Eyedropper Tool in the Tools panel.
2.  Right-click on the image, and choose Point Sample.
3.  Now try your Curves function again.
A second possibility is that you have a small selection made somewhere, and the Curves operation is only affecting that, so you're not seeing the change overall.  I know you said you checked everything, but you didn't mention checking for a Selection.
If these are not the issues, I have to wonder whether maybe something's wrong with your display driver.  Since OpenGL is involved in making the display, perhaps an OpenGL problem could be blocking the ability for the eyedropper to pick up the color.  What video card do you have and what version of the display driver?
You can test for OpenGL issues by temporarily deconfiguring the use of OpenGL Drawing:
1.  Edit - Preferences - Performance
2.  Uncheck [ ] Enable OpenGL Drawing.
3.  OK out and restart Photoshop.
4.  Does the problem still occur?  If so, a driver update may fix it.
Hope this helps.
-Noel

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