MS04-028: Patching Office 2003 and Office XP with Free Service Packs on CD
You can order the CD, and it's even free, but there's the possibilty of a good week or so wait. If you know someone who has high speed Internet or if an admin can burn a CD at work for you that can help. I'm on dialup at home and I also had to burn my own copy.
Still, everyone should get patched up on Windows immediately with Windows Update and you can get Office XP protected later, as most likely the 1st threats will be thru email and hostile web sites. AV protection can help you on Office until you can get that patched.
Office 2003 SP1
Office XP SP3