Quickly undo mistakes in the majority of Windows programs by pressing the shortcut key Ctrl+Z. For example, if you mistakenly cut or deleted text in Microsoft Word pressing the Ctrl key and the Z key at the same time would undo that change.
Most Windows programs also support the ability to undo multiple changes. Continuing to press Ctrl+Z will undo one change at a time often back up to 12 or more changes.
Redo the undo
If you undo something you mistakenly, pressing Ctrl+Y will redo the undo.