XP/Web Component in IE 6.x : Can't Check or Uncheck Data Checkboxes

[A Techie]

The setup :

IE 6.x
Windows xp machine
Web/XP components from Office XP installed
On a subnet of the WAN.
User given Admin/Domain Admin privileges.

The problem :

This machine loads the web/xp component fine.
But, when the user tries to check or uncheck
checkboxes within the loaded component, it's no go.
Can only see the data group and cannot drill-
down into the data.

Tried reinstalling the web component.

Tried using the IP Address of the intranet
site where the code exists rather than
by name.

Tried logging in as Domain Administrator.

Gave the browser 'trusted site' permissions
for that web site.

Brought the security permissions of the
browser down to level 0.

Any ideas or insight would be greatly appreciated !

Best,

-- B.