Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Try the steps suggested by Mike in the thread link given below:
http://social.answers.microsoft.com/Forums/en/vistawu/thread/599c707a-50f1-4763-9055-633731754194
Note: enable to enable normal Start-up after troubleshooting.
Sachin Shetty