USB Library
Windows

Attach the device to the host. If the host is a PC and this is the first time you have plugged this device into the computer then you may be asked for a .inf file. 

 

Select the “Install from a list or specific location (Advanced)” option. Point to the “<Install Directory>\USB Device - CDC – Basic Demo\inf\win2k_winxp” directory. 

 

Once the device is successfully installed, open up a terminal program, such as hyperterminal. Select the appropriate COM port. On most machines this will be COM5 or higher.

MLA - USB Library Help Version : 2.16
http://www.microchip.com/mla