Try I haven't installed my copy of Windows XP Pro in the first place (the machine I'm supposed to install WinXP Pro on hasn't even been fully built yet!). I want to be able run WinXP on a broadband connection without being wiped out by the Blaster, Sasser or other nasty viruses that can be avoided by installing security patches before I install SP2.
I think you're being just a tad overreactive there. Your CPU will not be tremendously inundated with superviruses the instant you connect to the internet. Trust me. I've built many computers and installed many copies of WinXP. Never had a problem. The only way you can get a virus like that is if you get a weird email with an attachment that you proceed to open w/out knowing its contents. Otherwise, you're fine.