Office challenge: Why doesn't [Ctrl]+z work anymore?

This week, test your general Office skills by discovering why a user's [Ctrl]+z shortcut no longer cancels the last action.

A user calls in a panic-she uses [Ctrl]+z all the time and suddenly, it's not working! Instead of cancelling her last action, nothing happens. What terrible gremlin has been at work in this user's system and more importantly, can you restore [Ctrl]+z's default behavior?

By Susan Harkins

Susan Sales Harkins is an IT consultant, specializing in desktop solutions. Previously, she was editor in chief for The Cobb Group, the world's largest publisher of technical journals.