I will just jump in here for a side comment, I don't want to derail the interchange. Do not run your system out on the internet without a firewall, that's like walking through the jungle without a gun. Some hacker will drop a backdoor trojan on your harddrive, and you will have problems that will keep you up at night.
The best all-around bargain for a super anitvirus and firewall is Trend Micro, PC Cillin. Newegg has bargains on it all the time, Newegg has it
Here.
Note that you can pay as little as $15 with rebate if you can provide proof of ownership of Norton or McCafree, read the rebate coupon carefully. If you do this, be sure to deactivate the Windows Firewall. Oh, and you are right, XPs firewall is garbage.