Symptoms

Installation of an Acronis product fails in Windows. MSI log shows this error:
Failed to grab execution mutex. System error 258.

Cause

This error can been caused by one to the following:

• Msiexec.exe process is already running on the machine
• The registry string PendingFileRenameOperations is currently populated and the computer is waiting to be restarted.

Solution

1. Open the Windows task manager (right-click the Task bar and select Start Task Manager).
2. End any remaining msiexec.exe process running: select the process and click End Process.
3. Reattempt the installation.
4. If the error remains, reboot the computer and run the installer again. A second reboot, after installation, may also be required.

More information

Please contact Acronis Support if you need assistance.