Marcia,
We have a lot of VFP apps running in Windows 7 without difficulty. Suggestions include virus scanning as discussed, also the specter of UAC depending whether dbf, ini or other files are updated in locations where UAC expects admin escalation. Running the app as Administrator may confirm whether there are UAC issues.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1