can't resize Photoshop application frame

I have iMac OS X 10.6.8 and have been running Photoshop CS5 for two years. Recently the photoshop application frame extended below the bottom of my screen so I can't grab the lower corner and manually resize it. Also, I can't change the screen mode in the drop down menu. I think messed up the settings when I resized the type on different applications as a test for a friend of mine. Is there a way to reset the display in both photoshop and in the apple drop down menu that will enable the photoshop application frame to fit back on the screen?