Please help me........

[Brett's Honey]

We've been havng some computer problems lately. Everything seems to be ok right now except for the way the monitor display looks. About 3/4 of the screen stays white. When you change the wallpaper, only the left side, about 1/4 of the screen, shows the picture. When you right click on the white part, nothing comes up. To right click and get to display properties, screen saver, etc., you have to right click on the left 1/4 part of the screen that is showing the picture. I've gone through the troubleshooting stuff - no fix yet.
Any ideas..........

Thanks!!