ClearName (no install)

With ClearName you can wipe out the last logged in user name from the
Windows login prompt. If you are concerned with security or just want to
"hide your tracks", just add ClearName to your login script. ClearName
runs in invisibly, so when you launch it you never see a thing happen.
Once ClearName erases the last login name, it closes down. ClearName can
be run from a Novell or NT/2K login script, or from the Windows Startup
Group.
http://www.rjlsoftware.com/software/utility/clearname/

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