microsoft.public.windowsxp.security_admin

I cannot figure all this security info out anymore. So I will make a few
differnet questions.

first, If i have windows firewall on, now do i still download windows
defender (does that still exist?)

I have DSL i have their firewall set to low (this is a regular firewall I do
not pay for it), so i assume things come thru the DSL firewall, then go thru
the windows firewall is that correct? Does it make it more secure?

thanks