Download and run TWEAK UI Powertoy for Windows XP.
Click on "Logon" and make sure the account appears on the welcome screen.
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As an aside, you could TAKE OWNERSHIP of the the folders that belong to the other account.
I have XP Pro and recently tried to create a second admin account. Upon creation of it, the main one (with all my files) disappeared and now I cannot find any of my files. I still see a folder in "Documents and Settings" called "Administrator", but I cannot access it. Please help...
Thank you very much