You need to get a Memory Card with a connector to the PC or one of the solutions that connect your 360 HDD to the PC.
http://amazon.co.uk/s/ref=nb_ss_w_h_?url=search-alias%3Daps&field-keywords=Data+transfer+kit&Go.x=0&Go.y=0&Go=Go
I have the first one on that list, it hooks my Memory card...