Once you receive your new motherboard make sure to run the "Sysprep" tool from Windows 7 it's a little option that will restore your windows 7 installation back to the defaults of a fresh new one but without losing your programs and files.
It will just reinstall the appropiate drivers for your new motherboard chipset, hard disks, vga and so on....
In order to enable it you must do it right before you dismount the old computer to connect the hard disk to the new one.
You must start the sysprep utility which is located at "C:\Windows\System32\Sysprep.exe"
Then select from the little box the options from this window:
Please keep in mind you should click OK to start the tool preparations and once it's over the computer will shutdown by itself, this is the moment where you must unplug your HDD from the old computer to the new one then turn on the system so windows can do the restoration.
And that's it you just migrated your old windows 7 installation to a brand new computer without crashes!