HKEY_USERS\.DEFAULT
This is the default registry settings that NT4/2k/2k3/XP assigns to anyone who is new to the computer.
HKEY_USERS\S-1-5-18-blah-blah-blah is your current logon, which at first is an exact copy of the .DEFAULT key, until you use your account for awhile.
Which one are you? The S-1-5-18, which is identical to HKEY_CURRENT_USER.
Just some information.
oh and, for more info....reams and reams of info....go to
www.jsiinc.com/reghack.htm