Quickest way is with ethernet connector rj45. If you have an ethernet card in your PC and one in your laptop, a crossover cable works really great and its fast.
The easiest way is to buy a harddrive 2.5 or 3.5 and put it into a USB external box. I got a Datafab 2.5 enclosure for only $39.99 at www.mwave.com
MDL-2USB. They used to have a 3.5 enclosure also for $49 I do not know if they still have it or not. I upgraded my laptop drive to a larger one and use the old one for backup and exchange between my laptop and PC. Depends on how often you exchange files. If you find your going to need to transfer files often to your pc, then maybe setting up an ethernet crossover cable is in order.