Solution: Issue generating PDFs (Acrobat 8.1.1) from MS Word 2007

I am posting a solution from Adobe Support.

Note: This issue is specific to MS Word 2007 (none of the other MS Office 2007 applications) when Fully Functional PDF is selected as the option. My OS is Windows XP (I do not know if this is an issue with Vista)

Issue:
In MS Word 2007, select the Acrobat tab, Create PDF icon. The process moves through the Save As dialog and appears to be creating a PDF (the progress bar appears). But, the process stops and no PDF file is generated.

Solution:

1. Open Word 2007
2. Select the Office button
3. Select Word Options, Popular
4. In the Personalize your copy of Office section, fill in the User Name and Initial fields (if MSOffice displays in the Initial field, change it to something else).
Click OK.
5. Close all MS Office 2007 programs. Wait 1 minute (you must wait this amount of time).

6. Open Word 2007 and the PDF Add-on will now work.