I have a friend who has a problem with Photoshop. He has tried this with two different versions of Photoshop and the problem still remains. The problem in question is that every time he tries to do a "CTRL + key" command it doesn't do anything. It does something when he presses CTRL, but when he hits another key nothing happens, which means he can't use a shortcut for undoing, redoing, saving, etc... How can we fix the problem?