I've not got a lot of time tonight ron, but the basic outline is download and install the ext2 drivers for windows...
http://www.fs-driver.org/
And then the tricky bit is formatting the drive in EXT2(or ext3) because you'll need to download a live linux CD (live just means you can boot and run the computer from the CD) and then format the drive from within linux ..
I'd personally use ubuntu.. which if you follow the steps for downloading, then "Burn your CD or create a USB drive" and the try it (note trying, DO NOT use the install option) that are here... (go for version 10.04 and 32bit)
http://www.ubuntu.com/download/ubuntu/download
Once you've done that you need to use the utility on the CD called Gparted to format the partition on your USB hard drive as an EXT2 partition... If I remember gparted is on the system menu (along the bar at the top in ubunntu) and then under administration....
VERY IMPORTANT! make sure you've selected your USB drive from drop down list in the top right of gparted and then right click on the graphical representation of the drive and then format the partition to EXT2