How to kill a task that is "lacking an instance"?

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http://superuser.com – Okay, here's the deal: Spotify first killed itself but "something of it" kept lingering which was detectable as a task with PID 8664 and judging from the fact that RAM usage kept changing from time to time - it "did something". Now first of all this process kept me from listening to music because Spotify refused to restart due to this instance hanging around. So I tried to get rid of this process. But neither task mananger nor the taskkill command (as Admin of course) succeeded in doing so. taskkill at least gave me a "reason" which I will translate here. >taskkill /pid 8664 /f >tas (HowTos)