User Accts deletion

XP SP3
I am the owner, the only user, and the administ.
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I enter the beast w/o any user accts showing at Logon, but I do have some of them, much too many, to my taste, all showing in Win. Explorer.
This, after reinstalling XP (new install)

My q: Can I safely delete accts?

I have: Admin, admin.(comp name), All Users, All Users. Windows, 2 personal accts (don't ask me how I ended up w 2), Default User.Windows, and Guest.

If the answer to my q is yes, what can be safely deleted?

Thanks,

BDS