JSI Tip 4591. You can't run a .MSI install because an installation is in progress?

When you try to rin a .MSI (Microsoft Installer) package, you can't because another installation is in progress?

After restarting your computer, you receive the same error message?

To clear the previous aborted installation:

1. Use the Registry Editor to navigate to:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer.

2. Delete the InProgress subkey.