Please help screen display gone banana's

Hi all,

Our p.c. home is gone demented. We have Windows XP and when my sister turned on the p.c. the display was upside down. I have tried to alter it in the Control Panel and also on the Menu Screen button on the front of the screen but nothing works. I'm typing this message with the screen turned upside down . Can anyone shed any light on this for me :foolish

Thanks guys.

 

Thanks very much for that it worked