Error 1500: Another Installation is in Progress

An installation fails to start with the following error:

Error 1500: Another installation is in progress. You must complete the installation before continuing this one.

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Alternative manual troubleshooting steps are given below:

Quit another Installation

As the error clearly indicates, an installation is already running on your system. Abort the installation and then try again.

Quit Background Process

Figure out and forcefully abort the background installer process using the Task Manager.

1. Press Windows Key + X; choose Task Manager.

2. Click “More details” to expand the user interface.


3. End the following tasks from Processes tab:

  • Msi.exe
  • Setup.exe
  • Installer.exe


If no such items are found in the Processes tab, look at the Details tab. Click an item, and then “End task” button.


Stop Windows Installer Service

Use the Services tool to terminate Windows Installer service.

1. Type “services.msc” in the Search Box on your Taskbar.


2. Scroll down; right click “Windows Installer” service, and choose Stop option.

Restart the PC

Restart the computer and try loading the installer again.


Remove Installation References

A previous installation hasn’t removed Registry reference containing information about active installation status. Delete the Registry reference and then reinitiate the setup.

1. Type “RegEdit” in Search Box and open that.

2. Locate the following sub key:

  • HKEY_LOCAL_MACHINE | SOFTWARE | Microsoft | Windows | CurrentVersion | Installer | InProgress


3. Double click “Default” string; delete its value.


4. Click OK, and then exit.

Reregister MSIEXEC

MsiExec file entries need to be repaired. Unregister and reregister the Registry entries pertaining to Windows Installer components.

1. Open elevated Command Prompt. Press Windows Key + X; choose Command Prompt (Admin).


2. Execute below commands:

  • Msiexec /unreg
  • Msiexec /regserver
  • exit

3. Restart the computer.

Use Clean Boot

Place your computer in clean boot mode. It starts Windows with a minimal set of startup items and drivers.

1. Type “MsConfig” in Search Box, press ENTER.

2. Choose “Selective startup” option from General tab.


3. Uncheck the box named “Load startup items”, and then save the changes by clicking Apply, and then OK.

Reinstall Windows Installer

Delete Windows Installer component files and reinstall the package.

1. Double click This PC icon on Desktop.

2. Open the following location:

  • C:\Windows\System32\

3. Delete the following files:

  • Msi.dll
  • Msiexec.dll
  • Msihnd.dll

4. Download latest Windows Installer version from Microsoft Download Center. Use the Search feature.


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