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, "Jeff". 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. When I log in
as "Administrator" I find a folder "Jeff" (a folder icon with 2 people in
front of it) in "Computer/c:/Users." I want it to go away!!

There are only 2 visible users on the start up screen: "Admin" and "Self".