cant load avast

ok this what going on , I’m try to use avast internet security 5.0. i remove McAFee. and try loading avast . it load all the way tell i get to loading fire wall . and shut down my internet .when it come up , and say sever not found . cant load it help and i all ready pay for it . and i took mcAFee. off and if i can,t load avast now . help it say i got a cable unplug but i don,t . i call my internet com to see if it was them and they said no . and i know i don,t have a cable unplug and i can,t get on internet now ,

Ensure that all remnants of McAfee are removed:

2007 version - http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe

Also see - How do I uninstall SecurityCenter? http://ts.mcafeehelp.com/faq3.asp?docid=71525

thx DavidR will try ,.

You’re welcome.

this is not on my cp its on my girl cp. she said avast will load all the way up to the load fire wall then i stop and it kick her off her . internet. and turn her router off take her ip address off and she can.t put it back tell she does a restore,