WildEagle

No no, don't do the reformat just yet. First try the suggestion to Rollback the driver

Second, if the driver rollback doesn't work go in to Device Manager, and select Network Adapters, right click on the listing for your onboard RealTek Network Connection and select Uninstall. If given the option to uninstall the drivers, don't right now and reboot. On reboot, Windows will attempt to reinstall the device and drivers.

If this fails, uninstall the device again, but don't reboot. This time click on the Start Button and go to Settings, followed by Control Panel, and open Add Hardware. Then click the next button and choose the second option on the screen that comes up. This will allow you to scroll down through a list of devices until you come to Network Adapters, highlight that and click the next button. Then on the manufactuer list, if RealTek is listed, select the correct Network Adapter and select the option to have Windows Vista attempt the driver installation automatically, or select the Have Disk Option and point it to the directory that the extracted drivers are in. This will usually work.

If it doesn't do another reboot, and then after Windows Vista attempts to install the driver for your onboard RealTek Lan, go in to device manager, uninstall the device, and if given the option to uninstall the drivers for the device, do so, and reboot regardless. Then on booting back in to Windows attempt to install the latest drivers for the onboard lan, which can be downloaded from RealTek or the drivers you downloaded from Gigabyte.

If none of this works, then try the reformat and reinstall of Windows Vista.