Photoshop color change versus Windows XP

I have just installed Windows XP and re-installed Photoshop 7. When I click on the color square to bring up the color palette so that I can change the color the cursor changes to the eyedropper icon and will not do anything. I can't change the color and I can't get out of the eyedropper. I have to shut down the program.

Have you recently changed monitor resolutions or had a dual monitor setup?

See the FAQ called Dialog Box Missing.