This video will explain how the rotate the monitor screen in windows xp service pack 2 and 3 versions.
Its just few steps to follow :
Step 1 : Make sure that monitor supports Rotation Feature
Step2 : Press the ctrl key along with alt key and press the downward key i mean navigation keys in the keyboard that up down left right, press the down key to see the changes on the monitor.
step 3 : to bring it back to its old position, press the key down key continously..