Asus does not supply Vista drivers for this model (which you might have tried in Win 7), let alone Windows 7 drivers.
You are left with the option to identify the manufacturer of the various chipsets on the motherboard (audio, video, etc.) to see if you can find drivers for each. Please be aware that even if you do find drivers for individual components, they may not work
with your motherboard.
With a motherboard this old, I'd either update to a current model or stick with Windows XP.
Microsoft is conducting an online survey to understand your opinion of the Technet Web site. If you choose to participate, the online survey will be presented to you when you leave the Technet Web site.