Ummm try to reconfigure it. Look for a GEOMETRY selection in the menu. It should have setting for sidways/slanted up/down position etc..
You should be able to change it by right clicking on the desktop>Graphic Options>Rotation>Normal. If anything is currently working in the correct direction right now, though, (including your arrow/pointer/whateverthehellitis) you might not want to mess with that. It could take forever to fix if things are already sideways. xD