I have been trying to install the update and am not even able to logon as administrator without getting the message that a reboot is required.  I have tried rebooting and waiting for at least 5-10 minutes to attempt to login again as administrator.  I have also tried having WordPad open.  The other suggestions are beyond my capabilities.  Since you are only allowed so many logins when an update needs to be installed I have run out, so am not able to access QuickBooks at all.  We have a tech person, but he has had a major medical issue, otherwise I would be asking him for assistance.  Since I can't login I'm not able to contact anyone through chat via the software.