Click the File Tab in 2010 and click on Info, then Check for Issues and select Inspect Document. To view the Personal Information click on Show All Properties to the right. In Office 2007 click on the Office Button, Prepare and then Inspect Document. To view the Personal Information before removing it click on Prepare and then Document Properties.
Select content you want Word to check for metadata
If Word finds metadata, it will prompt you to Remove All. Once you click Remove All, it cannot be undone.