I had mixed results when attempting to enable full screen magnification on Windows 7. As someone on this list stated it does partly depend on which theme is active. However, even when I was using a supported theme the results were inconsistent. At times, full screen mode from within Magnifier was available, whereas at other times it seemed to mysteriously be unavailable. Perhaps there was a trick or technique that was not obvious to me but, when I was working with Windows 7 with my students, I was not getting consistent results.