On some computers, when launching the Power-user.exe setup, the following error will appear, stating "This installation package could not be opened. Verify that the package exists and that you can access it , or contact the application vendor to verify that this is a valid Windows Installer package"


This installation package could not be opened


This is an error coming from Windows (not from Power-user). It can usually be solved quite easily.

Step 1

  • Delete the file you have already downloaded.
  • Download the file again, from a different browser. 
  • Place the .exe on a local drive (Windows will be more suspicious if the package is on a network drive).
  • Try again to install the setup. 

Step 2:
  • Go to the Windows "Start" menu and click on "Control Panel".
  • Go to "Administrative Tools".
  • Click on "Services" and scroll to "Windows Installer".
  • Double click to bring up the service.
  • Check to see if the startup type is set to "Manual".
  • Service status is usually stopped. Try and start the Windows Installer service.
  • Now try to install the setup.

Step 3:
  • Click the Windows "Start" menu, and type "cmd".
  • Then right-click and select, "Run as Administrator".
  • At the command prompt, type:
    • Type msiexec.exe /unregister, and then press ENTER.
    • Type msiexec.exe /regserver, and then press ENTER.
  • Now try to install the setup.

Step 4:
  • Click the Windows "Start" menu
  • Type: "CMD", and from the results, right-click "CMD"
  • Click "Run as Administrator".
  • At the Command Prompt, type: sfc /scannow
  • This will check for any integrity violations and fix any corrupted operating system files.
  • Restart your system.
  • Try again to install the setup.

Step5
  • If applicable, deactivate Cisco Secure Endpoints from the Task Manager
  • Try again to install the setup