Can't remove mcafee firewall

I seem to be having problems removing my mcafee firewall and security center that came with the dell. When i go into add and remove programs and start the uninstall process an error message pops up saying that i cant remove it because it missing an install program!! when i first uninstalled the virus protection it would not do all applications at the same time so now i cant remove the firewall. I do not need nor want mcafee because I use a different program. Everytime i start up the computer i get the error message that mecafee is not installed properly and reinsert the installition cd. I have never had this much problems removing any program!!!!