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I cannot start virtual machine after upgrading my Mac to OS X Mavericks. I get either a "Virtualization support is disabled" or "Unable to load the Parallels Driver" error message.

  • Parallels Desktop 9 for Mac Standard Edition
  • Parallels Desktop 8 for Mac Standard Edition


When you try to run your virtual machine on OS X® 10.9 Mavericks these messages may appear:

Your virtual machine may run slow because virtualization support is disabled on your Mac

The virtual machine performance may be degraded because the hardware virtualization support is disabled on the host computer.


    Unable to load the Parallels Driver


Parallels Desktop for Mac kernel extensions are not loaded on OS X Mavericks.


  1. Uninstall Parallels Desktop

  2. Open Finder, go to Applications folder -> Utilities; Launch Disk Utility
  3. Click on your Mac Hard Drive and then click on Repair Disk Permissions. Wait until the operation is done.

  4. Reboot your Mac.
  5. Download the Parallels Desktop installation package:

  6. Install Parallels Desktop:

Note: After you reinstall Parallels Desktop, you will have to reboot your Mac to install it properly.

For information on how to install OS X 10.9 Mavericks (release) in a virtual machine in Parallels Desktop 9, please see KB 118806.

For information on how to install OS X 10.9 Mavericks Developer Preview in a virtual machine please see KB 116282.

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