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Username Administrator is reserved for the built-in administrator account in Windows. Because of this name being reserved, the most common username users give to their administrative account is Admin. These two usernames are the first, together with your name, that every hacker who tries to hack in to your computer tries.
Not a fact, just a guess, but I'll say over two thirds of our members reading this have a user account called Admin.
Kari
The padlock overlay means "File/Folder is not shared". It is private to so-n-so.
What are those little overlay icons: Windows 7 edition - The Old New Thing - Site Home - MSDN Blogs
Does everyone understand now what the padlock means?A padlock. This means that you have a private item in a non-private directory. (See below.)
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A private item is an item where the only user account with access is you.¹ You create one of these, for example, by going to the sharing wizard and saying Share with: Nobody. To avoid clutter, the overlay is shown only when there is a transition from non-private to private. (Otherwise you'd have a lock overlay on everything in your Documents folder, for example.)
Thanks everyone for your input. I guess I will leave my Admin user name as is, otherwise I will be back where I started.