Need help developing Windows NT4 compatible Audio and Video device driver

[Helio]

Guys,

I know this should look lame for you, but I am new here and I really need a
Video and Audio Driver for my Intel G31 chipset (onboard audio and video),
and compatible with Windows NT4.
Doesn't matter how weird this looks (since its a brand new chipset and an
old OS) but that's a real need, since I can't find these driver anywhere.
Can you guys give me tips of how can I do that (I am an expert C/C++
programmer but never created a Device Driver before), or there is some easy
way to transform an Windows XP Driver in a NT4 Driver ?

Regards,

Helio