1. Click the start and then choose the control panel option

 

 2.Control panel window opens up. click Display

3. Choose one of the following: 
Smaller-100%. This keeps text and other items at normal size.


Medium-125%. This sets text and other items to 125% of normal size.


Larger-150% This sets text and other items to 150% of normal size. this option appears only if
your monitor supports a resolution of at least 1200 x 900 pixels.