Let me tell you now, Task Manager will not save you. Which Service is Freaking Out? It's literally "Service Host." You may have a dozen services or more running inside that process. There's many command line ways to figure this stuff out, like net start or sc query type= service or tasklist /svc But this post is about doing it the easy way
Click the checkboxes to the left of each of the svchost.exe processes (or just those that you care about). More complex is that you'll sometimes see multiple SvcHost.exe's in your TaskManager. This inevitably leads you to questions like, "What Services are running inside what SvcHost.exe?" and "Which Service is using 100% CPU." There's lots of ways to figure this out, but first You can see the PIDs for a running Service for the Services tab, but when a service goes insane, good luck nailing it down.