Instead of going through limewire...this entire thing assumes you are all on the same router and have admin rights:

have them share the folder you want files from
go to Network Neighborhood or My Network Places
find their folder and just copy/past their files into your shared folder...done! (plus if your network is configured with nice cableing and equipment you can reach transfer speeds up to 100 megs a second!

also works for them, just reverse the role.