KNOPPIX is a live disc (IE you boot off of the disc with no installing of any software). Anyone who deals with computers should have a knoppix disc lying around for emergency access to a computer. It is completely free as an ISO download, and you can do a simple image burn to a CD or DVD (depending what version you get).
No partitioning
No dual boot
No headache
(Just put the disc in the drive and reboot, and you have a fully functional OS that can mount FAT32 and NTFS discs and even connect with your home network). VERY useful as an emergency backup OS. I am sure there are plenty of people on BYOAC who have a KNOPPIX disc handy.
EDIT: If you havent gotten it yet, you can use KNOPPIX on a computer without a harddrive. On top of that, it can read "protected" directories. Please, do yourself a favor and DL knoppix (5.11) and burn it on a disc. Boot off of it (no install needed) and play with it. If anything, KNOPPIX will be the disc you will need if your XP craps out and you need to check your email (yes, it comes with a browser, but no M$ email client).
If anything, a copy of KNOPPIX is your best bet for any major OS/HDD failure. Just give it a try (an as I said earlier, there is no configuring of it, no partitioning, and no dual boot)