Robert Johnson, you wrote on Wed, 4 Apr 2007 15:18:29 +0100:

This operation has been cancelled due to restrictions in effect on
this computer-please contact your system administrator.

Conrol Panel | Internet Options | Programs

There click onto the Reset-Button

If you are using Internet Explorer 7 you'll find the button under the
Advanced tab.

--
Best Regards
Christian Goeller
http://www.outlookfaq.net