And they're all also big files, so you wanna have quite a strict path to follow.
Xandros has a free version that isn't too big (i think it was just less than 500MB), and is supposed to be great for beginners, so you might want to try that out.
Windows XP Pro 17" LCD Monitor (1280 x 1024)
nForce3 250 Chipset Athlon 64 2800+ w/ C'n'Q
1 x 512MB DDR400 CL3 SDRAM 40GB IDE 7,200rpm HDD (8MB Cache)
nVidia GeForce MX420 64MB PCI On-Board Audio