If, under Windows, the controls in the windows look somehow displaced, select Start, Control Panel, Display. Select the Settings tab and click the Advanced... button. Change your DPI settings to Normal (96 DPI).

If, under Linux, messages and captions appear very big, your display resolution is probably set too high. Use gnome-font-properties to change your default font to a smaller value or go to Details and set your resolution to 72 or some other more appropriate value.