In case Windows 7 does not successfully install the DLPCIe driver like what you see in the following screen shots.
Change it to Automatic update.
And if it still does not find the driver like what you see below.
Then go to your device manager and look under ports and LPTs and click on update driver software.
Choose Browse my computer.
Browse to where the SW_Windows_PCIe_NativeUart folder is on your CD and click on Next
The two serial port numbers will differ from one PC to another and you can change the number to your
desired available one.
That will complete the installation of the PCI Express driver for the card.
please note that in Win7 the second port is used for setting up the DF1 drive, later on.