Totally Newb question

I am installing Comodo firewall, and was wondering if it is necessary to delete or disable the Windows
firewall? Thanks.

Installing Comodo Firewall should automatically disable Windows Firewall. If it does not then please manually disable Windows Firewall as it is not a good idea to have both active at the same time.

Yes its a bad idea to use both at the same time , just install it , installer will do its work fine . dont worry about disabling or enabling it