1. Connect both the laptop and PC to the router, using standard ethernet cables.
2. Assume one system as the host and access the contents of the other system through it.
This requires you to create a 'workgroup' and have the other PC added (listed under) to it. Alternatively, you could click on 'view workgroup computes' to see if the other computer is listed.
(The above options are available in "My Network Places")
3. Once you see the other PC listed in the workgroup, just drag and drop the files into the location.
P.S: The direct connection between two PCs, via the LAN card/port, requires the use of a Crossover cable.