In Act I, the witches told Macbeth that he would become the thane of Cawdor, and then the king of Scotland. They then told Banquo that his children would inherit the throne.
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That being said, Service Host(svchost.exe) is a generic service hosting container. Any number of required system services can be running in them, so I would not get rid of them. You can use Process Explorer to determine what services are running in the host container. My guess is it's Windows Update or BITS running.