For reference to others, I had this problem with the upgrade stopping because of Trend Micro Internet Security 2008 requiring uninstallation how-ever it had been uninstalled years ago. The machine being upgraded was Vista Business.
To solve the problem, I used CMD (run as administrator), changed directory to Windows\System32\DRIVERS
renamed the file TMComm.sys to ZZTMcomm.sys and restarted the computer
Upgrade then proceeded
Regards.
Emcevee