I have a high resolution mointor. Buttons and icons of Photoshop interface are too small for me. How can I make them bigger?
In CS6 you can change color theme and font size in preferences->Interface. If your version is older there is nothing you can do other than lowering your resolution.
In theory changing the DPI settings in Windows will allow you to magnify what is displayed on the monitor - however it doesn't always work and some interfaces will look broken if you change the setting, but one can always try.