Download the file. In windows xp, open the file and select extract all files on the left side. Then, find a regular icon you want to change into a Star Wars icon. right click the regular icon and select "Change Icon" and select the folder you just unpacked.
If you have an older version of windows you will need a program to open the .zip file format such as Winzip.

138 of the BEST Star Wars Icons in PC format.

Download Star Wars

This is a smaller set of icons that I made also in PC format.

Download Star Wars Icons