listen, make sure sharing is enabled on both computers, and that both computers are connected to the same router.
then go to "my network places" and you should see all the computer names in there that share the same router connections.
if you cick on the computer u want to transfer files from and cant see anyting, make sure you set to view hidden folders , in folder options in the control panel.
then u might see somethin like "default" all grayed out.
then, from your main computer, connect to your own shared drive, go into that "default" folder and drop whatever file u want shared.
then on the other computer, since you can now see hidden folders, you should see the grayed out "default" folder, open it up and you will see the files that you shared from other computer.