Look for script stoppers, from anti-virus software or software firewalls.

In some cases people have reported making it work using "Localhost" as the
second argument to CreateObject.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm


"Alberto" wrote in message
...
Please help me.
I have a problem on some PCS with createobject ("Outlook.application"). On
some pcs works, on others error 429 is displayed. I followed all microsoft
guidelines and articles. It is Outlook XP witn Windows XP. I'm getting
crazy.

Thanks Alberto