Free Email Certificate Can´t Install

I receive an email about my free certificate, access the page, double-click but nothing happen, try to add in outlook but it dont find the file as a certificate.
I a newbie on that matter so if you could help me on the right direction I will appreciate.
Tks
Fabricio

PS : Windows 7 Home
Outlook 2007

Hi,

Try the Email Certificate Troubleshooter.

https://support.comodo.com/index.php?_m=troubleshooter&_a=view

Garry