It's well discussed but I don't see any reason for this system component to need to be changed from its default account.
I've noticed recently that an exe has been running in my task manager at startup called wmiprvse.exe. I looked up a description (http://www.neuber.com/taskmanager/process/wmiprvse.exe.html) of this process and it said it was a utility that allowed Windows to report information across an enterprise setup? (You'll have to forgive the butchering of the syntax). Also, it said that it would run as under LocalSystem, NetworkService or LocalService. Mine, however, is running as SYSTEM.
Is this something about which I should worry or is this normal?