if you will click any blank spot on your Desktop (the Main Windows screen) you will get this menu (or something like it)

You then click Properties.............

You will get something like this...............

Click on the Settings tab

to get to the resolution

settings

Make sure the screen area setting is at least 800 by 600.

You can slide the pointer to adjust

the resolution.

You may need to reboot after you

have finished.