RH

Can you be a bit more specific?  MY crystal ball is in for repairs atm.

Here : http://windows.microsoft.com/en-au/windows-vista/change-screen-resolution

Hello rebecca harkins,

Do you mean that you want to change the display resolution setting in Windows 8.1?

If yes, please refer to the following article to set your monitor to the  native resolution.
http://windows.microsoft.com/en-HK/windows-8/get-best-display-monitor

Additionally, you could try to update the display card driver from the manufacturer website.

Best regards,
Fangzhou CHEN