If you receive a certficate error when launching Vixie, please download the required certificate from the bottom of this page.

To import the certificate, double click on the downloaded file. then click Install Certificate:

If you have administrator rights, choose Local Machine. If not, choose Current User:

You will not need to change any options on the following page, click Next:

On the next page, press Finish:

You will then receive an "Import was successful" message.