Blank page in User Account Record

Archived from groups: microsoft.public.windowsxp.security_admin (More info?)

There is a default user account in WinXp and after I boot up the machine, I
don't need to login before getting to the screen. In some spyware tools, I
need to check if my default user account falls within the administrator group
before install. When I click on the <User Account> from <Control Panel>, it
shows a blank page with only the title bar showing buttons <first Page><next
page> and an icon. There are no response when I clicked the buttons or icon.
Is there something wrong with my user groups? How can I check for the
administrator identites from other routes?