Virtualization uses slightly different principles of functioning, it provides own Virtual Network Card and driver for it is installed while installing Parallels Tools. You need to have Parallels Tools installed and don't need to manually install any driver for the networking at Windows side, unless you are using USB-network card
Make sure that you have Parallels Toos installed and switch to the Shared Networking. Let me know if this won't help
Last edited: Nov 12, 2009