Can you please check this KBA
The Creator generated .inf and also this .inf will point to the Microsoft serial driver which is signed. Additionally you can use Microsoft certified driver from Cypress. These drivers will be installed if you have installed the Cypress Serial SDK
Link: http://www.cypress.com/documentation/software-and-drivers/usb-serial-software-development-kit need to bind the device to the driver in the installation folder in this case.
Using the CyWinCDC.inf file from the example worked. Thanks for your quick reply.