Dell Studio 1555

i have just recently bought a dell studio 1555 in sept. I then upgraded to windows 7 using dell's upgrade disk. i was just wondering if i wanted to restore my laptop to "Out of box state" how would i do this? i tried the f8, repair my computer way but it wont find the factory image. i know that the factory image is still there because when i click my computer the D:/ drive(RECOVERY) is still there. Is there anyway to restore it to factory condition???