In my many times I have upgraded to a new motherboard it has been a lot easier to format the drives and start new.
What I do is burn all of the programs, saved games, files that I want to disc's so I may reload them to the new computer.
The reason I do this is because it is nice to get rid of all of those programs and files that I don't want. In a sense a fresh start.
I used to know how to just upgrade the mother board but with all the spyware, hidden/duplicate files, and junk I gave it up for the fresh start.
Hope that helps,
P.S. Also now that you have your files on a disc, it will that much easier to re-load your files in case something happens.
Your Hardware Guide.