I HAVE RECENTLY RECIEVED SKY

Question

I HAVE RECENTLY RECIEVED SKY BROADBAND AND EVERY TIME I TRY TO ACCESS THE INTERNET IM BLOCKED WITH THE MESSAGE "INSECURE INTERNET ACTIVITY,THREAT OF VIRUS ATTACK"AND IT TRYING TO GET ME TO BUY THEIR PRODUCT "ANTI VIRUS 2008" EVEN THOUGH I HAVE McAFEE INTERNET INSTALLED.