unable to browse https websites
dear team
i am facing the following issues on my Macbook Pro:
- unable to browse https websites (facebook, yahoo,hotmail..) using Google Chrome and Safari6 while working
fine with Firefox , the page displays only text and plain format
-unable to connect the Appstore to the internet although i can browse.
-any website with certificates generates a certificate error message
pl. advise
MacBook Pro, OS X Mountain Lion (10.8)