Is it to block Google?
Not sure, why would it want to block Google?
Sorry, just a bad joke. Thought you weren't a google fan (must be mixing you up with someone else).
The native Windows 7 firewall is meant to be as good, if not better, than a lot of the alternatives. What OS are you using?
The best firewall solution is often your router - but not sure how 'expert' you have to be to get the most out of it. Do we have any computer security bods on here?