Try this...
Should probably work with Windows 7 or Windows 10 - You are using a computer with a Windows operating system and not a MacBook?
Right click on you "desktop," the screen with all your icons? A menu box should appear. Choose DISPLAY SETTINGS.
Look down the page and find the box that says RESOLUTION. it's probably set really low, like maybe 1028 x 768?
Pick the biggest one. Mine is 1920 x 1080.
it's worth a shot....