If u have changed your motherboard, it wont work until u have repaired ur windows installation. get a recovery CD and do "repair of OS" (not the F5 repair) u wont loose any data as this process only replaces the C:\windows folder.
Thank you. Will try that tmorrow. I'm not sure of this idea from a fried who suggests I install a new drive in the new computer an file transfer to new drive using transfer cable. How can that work if there is no OS on the new Computer?