Diplay Reversed

[ramki288]

Dear Friends,
In my Home computer, (P-IV- 2.4 GHz, Windows XP home edition, 512MB RAM, with office 2003) the MONITOR DISPLAY has gone UPSIDEDOWN as well as REVERSED! This happened while the kids accidentally pressed some keYs of the keyboard together, that is what they claim. I do not have any clue of really what had happened. Could anyone help me in getting over this problem?
Thank you.

[GX1_Man]

Control+Alt + an arrow key often works.  
Some cards like ATI have an icon in the lower right that will let you adjust the display as well.