Trying to uninstall Free Firewall version 3

I downloaded the Comodo Internet Security program Version 3.8.65951.477 : 26th Feb, 2009.Ever since I have difficulty with my internet connection.I downloaded the AVG premium virus program and the conflict began.I uninstalled this program and downloaded Karpersky Anti virus program and the internet connection was blocked again.I have a 32 bit Vista system and use a firewire connection.The program doesn’t appear in the add/remove program.I cannot access the program in any way to change the settings.It is like a stealth program.I am a relative newby when it comes to computers.
I tried the support route and was sent a program to remuve the left over files after removing the program using the add/remove.Catch 22,seems as i cannot do this and I am stuck with a debilitatting program!!
Can anyone help,Pleaseeeeeeeeeeeeeee?

Sure. Before That I Would Like To Have Some Information About Your System, So That I Can Guide You Using The Correct Uninstaller For Your Software

  1. At Present How Many Security Softwares Are Installed On Your System And What Are They?
  2. Name Of The Security Software You Need To Remove Completely ?