Hello Crabby Office Lady,
This error can happen because of an outdated video driver, to many programs running at one time or even high CPU activity. There is a link to a KB article on the following post that gives more info on the issue and helps to fix it, see:
L.D.
3. Make sure the hardware acelleration box is unchecked
4. Click close to save the settings.
5. Please exit full-screen mode, and refresh your page.