plzzz helpppppppp IRREGULAR shapes appeared

any graphic stuff in my computer hae irregular shapr (games.screensaver et.)please see this screen shot www.ahmedu3.8k.com/screen_shot.jpg

Did you try to plug a brand new monitor ?
May be it is faulty or too old and dying.
Much more details in your question helps if you need answers (type of video board, type of monitor, Operating system, etc…)