Download the MSI for the VMNEt driver and go through the standard installation process. The VMNet Driver will get installed.
To check if you have the correct driver installed, Open Network Connections and right click to Properties. You will see a window that lists all the software connections on the machine. Virtual Machine Network Driver (or Services) will be in there as an item.
The VMNet Driver is also added in the Control Panel --> Add/Remove Programs Tab. So if you want to uninstall, just go here and remove the driver.