Options for 'Fixing' A Pirated Copy of Windows

PunkOfLinux writes "My parents are running a pirated copy of windows that my mom received from a teacher at school. My parents want to go legit, and buy a copy of Windows, but they are afraid of deleting everything and having to reinstall all their programs. Seeing as I know you guys will have an answer, I'm going to ask you: What would you do in this situation?"