"Microsoft Word documents can be lost in certain situations. For example, the document may be lost if an error occurs that forces Word to quit, if you experience a power interruption while editing, or if you close the document without saving changes. This article explains steps that you can use to try to recover the lost document.
Note The whole document may be lost if you have not recently saved the document. If you have saved your document, you may lose only the changes that you made since the last save. Note that some lost documents may not be recoverable..."Word Regenerator and RecoverMyFiles are commercial programs that might do these steps but made much easier although you obviously pay for it. My program also does it some.