From Jim Evans…
When you install either of the Photoshop programs, unless you choose deliberately not to, it installs a utility called Adobe Gamma. You should find this utility in your Control Panel (Start > Settings > Control Panel).
Double click on the Adobe Gamma icon and follow the steps. I’d be more explicit, but I’ve removed it from my system because it interferes with my external calibrator device. If you have a calibrator device you don’t want to use Adobe Gamma because it fights with the calibrator for control of the settings.
