Hi Eileen, the million dollar question is, what version of MEP have you got. The initial MEP 15 wasn't really Win 7 compatible, but will work, 14 and less certainly wasn't, so it may be time to update to a new MEP 17 that is actually Win 7 compatible.
Older progs may work, but you would need the latest burn routines from MAGIX. It may do it for you -