Right-click anywhere on an empty space on your Windows desktop, then choose Properties.  On the Settings tab, use the "Screen area" setting to change to the desired resolution.  For CU*BASE GOLD, a setting of at least 1024x768 is required (you can go higher as desired).

TIP: There are occasions where you might want to use even a higher resolution.  For example, when taking a CU*Answers University online course, the higher resolution may make it a little easier to see everything on the screen at once.  If a higher resolution is recommended for any of the CU*Answers education or help demonstrations, it will be noted so that you can change the resolution accordingly.  When done with the activity, you may change the resolution back to the standard.