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After installing ATI can't turn Win7 Defender on

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On Win7 PC before installing ATI 2016, I turned off Windows Defender as required. After rebooting, I could not turn Defender ack on. I get the error code 0x8001066ba. How do I fix this?

 

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Del,

Look at this Microsoft and run the Fix It tool found there:

https://support.microsoft.com/en-us/kb/931849

Del, doing a Google Search on error code 0x8001066ba suggests that this is an issue with Windows Defender itself, or that you have Microsoft Security Essentials installed on the same system which will give this error as Windows Defender cannot be run at the same time.

See: Error message when you run Windows Defender: "Error Code 0x800106ba" which offers a Microsoft Fix It tool for this issue.