I worked out a way (which you probably already know about, sigh!) to determine just what is running under the ubiquitous 'svchost' tag in Task Manager. Sometimes you may see a large amount of cpu or ram usage and/or page faults.

In Task Manager, Processes, View, Select Columns, select PID as a field to show. Now you can see that various processes/services have a unique PID.

If you don't have XP Pro, download Tasklist.exe from here: http://www.computerhope.com/download/winxp.htm and save it in your [username] folder.

Then click start, run, enter cmd /k, then enter tasklist /svc.

You'll see a list of processes/services with PIDs.

Match your PIDs found above to determine which specific process/service(s) go with which svchost.

At least now you have a namne for them.