McAfee Firewall

Anyone else have this problem - Cox updates to Firewall block internet connections. My computer stopped working a week ago, Cox said it was my Network interface card, Dell said it was a driver problem, purchase of a new card and download of driver updates didn't solve the problem. Office Depot told my wife we needed a new wireless adapter, haha. I finally enlisted a prof from a local college and he figured out it was the McAfee software - switching off the Firewall and Eureka - Internet connection restored