How do you change the screen size of your computer?

i got a game it used to work and someone reset the settings and i dont no what to do what the screen please help meHow do you change the screen size of your computer?
You should be able to right-click your desktop and select properties. 1 of the tabs should have a selection where you can adjust the screen size of your computer. The information I'm giving you is for a Windows program, I have no clue how to work with Macintosh though.How do you change the screen size of your computer?
Go into the control panel and click display, or in Vista, ';personalization'; . The click Display Settings, and then drag the slider near the bottom of the window to a higher resolution.