Error:

The windows installer service is unavailable. Another application may be running setup. Finish any installations in progress, or restart your computer, and then rerun setup.

Error Message:

Causes:

• The Windows Installer Service that is included with OS is unregistered or damaged.
• The issue occurs when the system account does not have full permissions on a folder or registry key that the Windows Installer is trying to access.
• The Windows Installer files that are on your hard disk are damaged or are missing.

Solution 1:

• Click Start, and then click Run.
• Open Command prompt as administrator.
• type msiexec.exe /unregister
• Click Enter to Unregister.
• Type msiexec /regserver
• Click Enter to Register.

Solution 2: Give Full Control permission to the SYSTEM account

• Open [C:\Windows] right click System32 folder > Properties > Security >
• Select “SYSTEM” & give Full control permission.

Solution 3:

Configure the status of windows installer service to Stopped & startup type to Disabled. Restart the system & change startup type to Manual and try installing again.

Solution 4:

• Navigate to C:\Windows\System32 folder
• Rename the folowing file names- msi.dll,msiexec.exe and msihnd.dll.
• Restart the computer and install windows installer 3.1 or latest version