Enable Windows Installer Service

• 1). Click the "Start" button on your task bar, type "services.msc" in the text box and press the "Enter" button on your keyboard. This will launch the Services windows.
  
  
• 2). Scroll down to the "Windows Installer" service in the left-hand menu. If the service is set to "Disable," you will need to change it.
  
  
• 3). Right-click "Windows Installer" and choose "Properties" from the menu.
  
  
• 4). Select "Manual" from the "Startup type" drop-down menu.
  
  
• 5). Click "OK" to save the changes to your service.
  
  

Re-Register Windows Installer Engine

• 1). Click the "Start" button on your task bar, type "cmd" in the text box and press the "Enter" button on your keyboard. This will launch a black command prompt screen.
  
  
• 2). Type "MSIExec /unregister" into the command prompt and press the "Enter" button on your keyboard. This will unregister the Windows Installer engine.
  
  
• 3). Type "MSIExec /regserver" into the command prompt and press the "Enter" button on your keyboard. This will re-register the Windows Installer engine. You should now be able to install or uninstall programs without a Windows Installer error.