I knew about this trick when I was fully switching over to amd during the beginning of 2010.
You maybe in luck if you are still working with this installation issue.
As long as your chipset was the same as your old one and you have retail copy of windows 7, that procedure repair should fix up mostly everything.
Windows will make you do a mandoratory reactivation call to ms, just tell the automated system and rep your key was only one computer only and you had to get a new motherboard replacement.
They should gladly do that for you once they verify it and get you rolling.
You do have a low chance of that repair reinstall feature I mentioned failing.
If your parts are way to new and windows update server does not have a list of drivers for it to patch up, you will need to a normal clean install of windows and start new again.