Please provide more info about the config. What antivirus are you using? What are your windows settings that you have changed since you did the install?
OH wait, it sounds like that you cant reach websites that are using ssl security. (in the adress bar https will show up instead of http)
Sorry i am going to bed now, but you can do some googling on this:
can't access ssl sites
and you might find the clue to the problem