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(Solved) Windows 10 Error 1500 another installation is in progress

Today I have get "Error 1500 another installation is in progress"  error message while upgrading my VMware vSphere client to 6.0 update 1. Error 1500 is a general MSI (Microsoft Installer) install error message resulting into failure.

"Error 1500 another installation is in progress" caused due to of below reasons.
1. TWO MSI installer running at the same time and by default MSI will not allow to run two installers at same time.
2. In-Progress key left behind if an earlier installation attempt is cancelled forcibly via the Task Manager.
To solve this issue below two workaround will work for you on Windows 10.

Solution 1->
1. GO to "Task Manager" -> "Details" and End Process Tree of "msiexec.exe"

2. After killing "msiexec.exe" process tree, try to run setup again.

Solution 2->
If above workaround does not work then try solution 2,
  • In the Windows 10 search box type "services.msc" and click OK to open Windows 10 Services.
  • In the Services window that opens up scroll down and look for "Windows Installer".
  • Select Windows Installer and Right Click and select Properties.
  • Click on Startup type drop down and select Disabled.
  • Click Apply and then Click OK.
  • Now Restart your computer.
  • Repeat the above steps 1 through 4.
  • In the Windows Installer Properties window, Click on Startup type drop down and select Manual.
  • Click Apply and then click OK.
  • Then run the setup again.