Need Help with new Wireless Router

Question

I have just purchased a Belkin Wireless G Router. I have been unable to access the internet. A call to tech support ran me through a bunch of steps and about 30 minutes of frustration and ended with the tech telling me that I have firewalls blocking the router. I set everything up according to instructions. What is my problem here? I've tried disabling Windows firewall as well as disabling BitDefender my anti-virus with no luck. After looking in every place I can think of to check I am nearly in the fetal position under my desk.
Thanks,
Lisa