>I need to write a program to download files (zip files) every night from a secure web site.
>
>Is there a way to to do this automatically.
>
>I already installed the security certificate in my computer which is required to access that site.

Can you FTP from this site? If yes, you can check Robert Abram's class from Download section here (this one I use) or Rick's Strahl site www.west-wind.com