Windows freezes or applications freeze after you install security update 3076895

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Symantec Endpoint Protection (SEP)Notification Area icon shows that it’s in an unknown state.

Symantec Endpoint Protection Small Business EditionPolicies aren't updated.

Client UI may not open.

The portal isn't updated with the status of the client.

Symantec Security productsApplication stops responding.

Monitoring status isn't displayed.

On-demand scans don't run.

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https://support.microsoft.com/en-us/kb/3090303