Transfering programs from one computer to another using programs like easy transfer can create problems. I've done it twice (Wife's system)- once from XP -> vista then from the Vista machine to a new win 7 computer. Basilly from the old win XP -> new Win 7 computer With the Vista computer an intern stop over.
I did this for a very similar reason, lost installation disk, or programs that I would have had to load an old orignial program and then several upgade to it.
The only problem I had is that several programs (uSoft word one of them) had to be re activated.
Question did you go from an Win XP 32 bit to a Win 7 64 bit operating system, if so I think that is your problem. Even so Do you still have the Key for your usoft Office product - It will require that as it Knows it is on a different Computer and require re-activation.