Webshield blocking too much on my XP machines

Hello!

Everytime searching for s.th. Avast blocks going forward in getting a result of my question with a ‘ssl*’ message, which I don’t understand.
How can I get rid of that blocking?

=Snake=

A screenshot would help

Well, that isn’t easy, for Avast WebShield is popping up several times with ‘ssl*’-certificates, which are not valid anymore.
What can I do?

=Snake=