Each user profile will have the same directory tree. "Application data," for example, will appear in all user profiles under Documents and Settings.
all of them are necessary, and none should be deleted.
In the 'screen shot' you provided, I see only 2 accounts other than ADMINISTRATOR. "Users' is not the same as user accounts. Windows calls itself a 'user' under some circumstances. 'Default user' and 'All users' are folders that Windows keep information about itself as it pertains to various configurations relative to which account is active. Those are Windows' folders, not yours. If you change and/or delete them you run the risk of seriously compromising your installation.
If you open User Accounts
from the Control Panel,
you will find all the accounts on your computer except, in XP Home, for the overall ADMINISTRATOR account which is only available from Safe Mode.
The ADMINISTRATOR account should really be used only in the case of diffuiculties. It is the "fall back" account when things get goofy. User accounts can become corrupt, and having a clean, good ADMINISTRATOR account gives you somewhere from which to work should that happen. You really
dont want to delete the account named
I keep another unused Admin level account on my computer as well just in case. If what you want is to boot through to your desktop without loggin in at the Welcome screen, Tweak UI offers that function.
The other folders about which you express concern are just default Windows folders. I have no idea why Xerox has a folder, but I do know that if you do manage to delete it, XP will re-create it at next boot anyway. All the folders you mentioned are necessary parts of the XP system and should really just be left alone.
It may be instructive to go to the View
tab of Folder Options
and select "Do not show hidden files and folders," and "Hide protected operating system files." This will allow you to see what Windows considers its own stuff. Yes, I can see them. Yes, seeing them is often useful. But I mess with them at my own peril.
If you really want to 'clean up,' get ATF Cleaner: http://www.atribune.org/content/view/19/2/