If I'm reading this right, all those "users" you mentioned are indeed a normal and necessary part of Windows.
I have these users listed under Documents and Settings:
They each have a specific purpose, so it's best to leave them alone.
Edited to add:
All Users, for example, is used to store security information so that all users on the computer have the same security protection.
Edited by Orange Blossom, 19 May 2010 - 10:08 PM.
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