Taming and Tweaking Windows Vista Services

Many services can run in a single process

In this case, at least 13 processes are running under s single Svchost instance. You'll need more advanced tools to identify which of those services is active at any given time, but it's a good guess in this case that Superfetch is doing most of the work.

For a detailed discussion of when and how to manage services, see Fixing Windows Vista, Part 4: Get smart about services