Firstly, please edit out your e-mail address before the Spamming idiots sell it to the other crooks and you start having bigger problems.
Display memory is memory (RAM) dedicated to the graphics adapter and some graphics cards come with their own memory while others borrow from the main system RAM. You must have some even if you're using onboard graphics so restart the computer and tap whichever key the screen tells you as it starts up to go into BIOS or Setup. Once there, look for a setting where you can vary the amount of memory (RAM) you "lend" to graphics. If yours is set on zero, step it up to 32 then hit Function 10 and Y to save and exit.
If you post back, please give some details of the computer - make and modekl,etc.