In Windows 7, it is easy to configure the monitor setup to use the 2nd monitor. Here are two methods to set up multiple monitors in Windows 7. Make sure that you connect the external monitors to your laptop or your desktop computer first.
Method 1: By keyboard shortcut "Win+P"
Press the Windows logo key + P on your keyboard. Select the Extended mode.
Method 2: By the "Screen Resolution" menu
Right-click any empty area of your desktop, and then click Screen resolution.
Click the Multiple displays drop-down list, and then select Extend these displays. Note If you cannot see the additional monitor(s) listed, click Detect. If does not work, try restarting your computer and do step 1 to 2 again.