Equisys Technical Notes

Technical guidance, explanations and fixes for our products

PRB: Zetafax Client upgrade freezes part way through the upgrade process



ID: ZTN1930

This Zetafax technical note applies to:

  • Zetafax 2012 Client upgrades to a later version, on Windows Server 2008 R2 and Windows Server 2012


When upgrading the Zetafax Client installed on a Windows Server 2008 R2 or Windows Server 2012 machine, the installer will freeze during the upgrade process.

On opening task manager, there will be an msiexec.exe process using 99% of a CPU core.


This is due to an issue with the previous version of Zetafax Client installer when it is being initialised for uninstallation. As some upgrade scenarios automatically remove older versions of Zetafax Client, users may face this issue.


The Zetafax Client will uninstall if the msiexec.exe process in the task manager is ended. To do this:

  1. Open task manager.
  2. Go to the processes tab.
  3. Select the msiexec.exe process that is taking 99% CPU.
  4. Click end task and click yes on the confirmation dialog.

This will allow the installer to reinitialise successfully, and thus successfully uninstall the Zetafax Client components and continue with the upgrade process.


This has been identified by Equisys as a problem with the software versions given above.

Last updated: 15th March 2013 (NT/MW)

Keywords: Windows 2008 R2 2012 upgrade freezing


Recent news

This article describes the new features and other improvements in the August 2019 release of the Zetadocs Expenses service. Zetadocs Expenses ...

This article describes the new features and other improvements in the latest release of Zetafax. This improves support for using Fax over IP (FoIP) with SIP trunks and public SIP fax services, ...