How can I delete a "legacy" User?

I'd like to remove a "user" from a computer with Vista Home Basic (installed
by manufacturer) that I bought from the original owner. I haven't
been able to figure out how to do that.

I cleaned all of the of the original owner's files from the computer that I
could find, then installed MS Office Enterprise 2007 on the pc. There are
only 2 visible users on the start up screen: "Admin" and "Self".

When I log in as "Administrator" I find a User folder called "Frank" (a
folder icon with 2 people in front of it) in "Computer/c:/Users." The
folder is filled with the default/standard folder set.

I want "Frank" to go away!! Could someone please advise me on how to make
that happen?? By the way, I'm an average fellow, not a programmer. Please
be gentle.