Windows drives on Airport never showing up

I am having a problem sharing my Windows formatted ext. drives through my Airport router. I have a usb hub on the router and 1 500gb Mac formatted drive hooked to it and using it as my Time Machine backup- seems to be working fine. I also hooked up an older 160gb ext drives (FATS32 formatted) drive to the airport and can't "find it" without going into the airport setup utility (it does show there) but not anywhere else, including on the kids Windows machines. Can someone please give me some info on how to configure this or make it show up on all the systems. My goal is that the kids could save their homework to the 160gb drive and I can open it upstairs on my laptop and review it for them and re-save it back to the drive without going downstairs to us their computer.
Thanks

Anyone - please?