so here i am. i hv this macbook for some repair.person who gave it to me dont hv any cd or dvd for reinstaling system.so i dont know where to start.il say that i cant boot into sistem,i try but when it get to system its all messed up,i cant start any aplication and i cant see toolbar at top left screen.so usless.so now i try to get new os.i downloaded some of them and i tried to reinstall,ofc i got problems. i must say that im doing all this from windows pc so read carefuly.i got snowleopard_10a432_userdvd in dmg format.i burned it on duallayer dvd media using nero and after that i tried to boot it on mac with holding C button but nothing happenes.i also tried external dvd rom and yet no luck.so i went in store and bought a 8gb flash disk and downloaded transmac in hope that i can mount image and than boot on mac.when i tried that program said that my stick dont hv enough room for operation.now im downloading another os called Mac OS X Install DVD Snow Leopard RETAIL which is about 600mb smaller.any hlp u can give me here guys?