I mean, we paid for it a year or so ago. Hope this is clear and enough information.
I know this doesn't help to solve your problem, but in all reality what you're doing is illegal according to the license agreement that you clicked "Accept" during the installation on your wife's PC as well as your laptop.
Read the EULA that's on the disk...a boiled down version says that you can't have two copies installed without two valid licenses. A work environment to a home environment is a bit different, though.
I'll leave it up to you to decide on the legalities.
edit: Forgot to add that B's solution seems like it should do the trick. Always helps when the error is posted verbatim!