hiii pink27
i know whats your prolem and there is a very simple solution for that
on your desktop right click and click on screen resolution
a window will open with 3 opting the third one is orientation
in that there are four options {landscape , portrait ,landscape (flipped) , portrait(flipped) }
try all of these dont click on ok but click on apply if that mode is not ok you can wait for 5 seconds
or click esc key on your keyboard and thats it your
problem is solved dear pink27
REGARDS
DINESH ZALADEKAR