Display rotated 90degrees

This is the strangest thing I've ever seen - my wife's pc (XP SP2) is using Serene Screen Aquarium screen saver - and suddenly when it starts up, the display is rotated 90 degrees! Nothing else seems to be affected, it's just when this particular screen saver activates (other screen savers don't do this) - I've downloaded the latest Direct-X and that didn't fix the problem. Any ideas?
steve

 

Go to setting on the screensaver and check if windows resolution and color bit
depth: is at default system resolution if not change it.....

 

there is another way to adjust your wife's display properties, if her desctop has intel video card then try this:
ctrl+alt+up arrow, may that would help.