Check out the pic and see if it's common for a firewall to block this many ips. I get this constaintly and I'm wondering if someone is trying to get in or what. I've been having bad luck with viruses and stuff.
Hmm, just checked my Sygate logs and most of the 2000 entries I have are on allowed. You may be hacked, I had a time too that I was constantly hacked and my logs were filled with entries like that (all blocked stuff). Don't worry about it, just be glad you installed a firewall.