1. Right-click on Windows 7 desktop and select Personalize. 2. In the left pane, click on Change Desktop Icons to open Desktop Icon Settings. 3. Under Desktop Icon Settings dialog box, select Computer icon and then click on Change Icon button. 4. Browse to the icon file that you would like to set as computer icon.. Right-click on Windows 7 desktop and select Personalize. 2. In the left pane, click on Change Desktop Icons to open Desktop Icon Settings. 3. Under Desktop Icon Settings dialog box, select Computer icon and then click on Change Icon button. 4. Browse to the icon file that you would like to set as computer icon.