If you're just referring to web browsing, press Ctrl and + simultaneously to enlarge text. (Press Ctrl and - to make it smaller. Press Ctrl and 0 to return it to the default size). Alternatively, you can adjust the text size via the View menu.
If you want to enlarge the way things are displayed in general, the easiest way is to select a slightly lower screen resolution. Right-click on the desktop. Select 'Properties' and 'Settings'. Adjust the resolution slider a bit to the left. Click 'Apply' and 'OK'.
Chris