I'm getting an Access Denied when trying to upgrade PerfPRO.
Check to make sure none of the PerfPRO apps or help pages are displayed. If so shut them all down and try again. If that does not work then try powering down your machine and download the upgrade OR go into your Documents/PerfPRO/Installs folder and run the installation.
You should never have to re-install PerfPRO. All data is lost when this happens.