It can be spyware or some user choice.
https://www.google.com/search?q=windows+security+center+service+won%27t+start+automatically+or+manually+in+windows+8.1&ie=utf-8&oe=utf-8 finds prior discussions with no exact do this cure. I'd follow this user's idea at
http://malwaretips.com/threads/windows-security-center-service-cant-be-started.13831/
That is, if the usual scans don't clear it up, join Malwaretips or BleepingComputer to post and wait for a helper to walk you through it.
Bob
windows security center service won't start automatically or manually in windows 8.1

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