How can I make my External USB Drive available on a wireless network, without a router that has a USB port?

all i want to do is make my 500GB USB Drive available to all computers on my wireless network. Does anyone know how to help me do this? I have a Desktop Computer, running Windows XP Professional & a Belkin Surf N300 wireless router [it does NOT have a place to plug in the USB Drive, only the Ethernet jacks]. The brand of computer is "Acer", and the model is an "AcerPower", i don't think that should matter, but I put it in here just in case. I don't have the money to go and buy a new router or anything, so could someone please help me soon? Thanks!