Here's how to create a hidden user account.
Start > Run > Regedit
Browse to Registry Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\
Winlogon\SpecialAccounts\UserList
Right click > New > REG_DWORD > Put the 'Name' what you want to User Account to be called.
Setting for Value Data: [0 = Account is Hidden / 1 = Enabled]
Exit Registry and Reboot
Rewritten in own words
Source:
http://www.theeldergeek.com/create_hidden_user_account.htm | or
link
Edit: Damn, sorry. Spent way too long on this post.