Change Mouse Left-Handed in Windows 7
Mouse right-handed is the default setting for Windows 7, if you are left-handed like me, you may need to switch the mouse setting to adapt your habit. Changing the default settings is quite easy for all of us. You can get the mouse properties by these two methods.
1. Standard Method
Click Start > Control Panel > Hardware and Sound > Device and Printer > Mouse, Screenshot as below:
Select the check box in Button Configuration for Left-Handed person, Then the right button will be primary (Right button will be the Left button), click OK or Apply by the primary button to take effect.
2. Quick Guide
Click Start, Type "mouse", then select Mouse in the search results, then you will get the window shown above immediately.