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Windows Defender is off and reports error Ox800106ba. How can I put it on?

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Windows Defender is turned off. Whenever I try to turn it on and open it, a message says that Windows Defender encountered an error: 0x800106ba and that a problem caused this program's service to stop. It suggests that to start the service, restart your computer or search Help and Support for how to start a service manually. Restarting my computer didn't solve the problem.

Windows Defender is turned off. Whenever I try to turn it on and open it, a message says that Windows Defender encountered an error: 0x800106ba and that a problem caused this program's service to stop. It suggests that to start the service, restart your computer or search Help and Support for how to start a service manually. Restarting my computer didn't solve the problem.

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Try Windows Defender support for help with that issue:
http://www.microsoft.com/windows/products/winfamily/defender/support.mspx