Hi im sorry if these are lame questions but i am new to online security and would really appreciate some help.
1. On a personal computer, would I have to open mail containing a Trojan from the potential Hacker?
2. I use Zone Alarm on my computer (running 98se) how do i know if (a) i have set it right and (b) is it any good?
3. I use AOL 9, it apparently assigns random I.P. numbers every time i sign on, is this so, and if so how would a hacker "find" my computer to hack it?.
4. Could a hacker get into my computer without me doing anything, ie without me opening mail etc?

I use Nortons 2002 Anti Virus updated regulary, Ad aware, spybot and a online Trojan scanner from www.trojanscan.com
From what i have read on this site these questions must be be really Lame to most of you but we all have to start some where
Thank you in advance
Mike