I *GUESS* that what essexboy wants from you is to run the *.inf file, but not from inside the zip itself.
Close every other program, including the device manager you have open before.
Open the new folder, the one that was created after the "extract all..." (be carefull not to confuse it with the zip!!!).
From that folder, right click the inf file and you should see "install" Run it, and when all is finished, reboot.
Just to be clear, I don't know what the driver "exactly" includes, so I don't know what exactly you will see after running the inf file. If you are unsure, you'd better come back and ask essexboy and wait for his answer.