How can i fix my drivers side Window ?

hi there got a renault megane coupe2001 everythings been good so far but the drivers side window has started to go first of all it stopped in a certain posistion and would only go upand down to that point so i took the door cards off and fidled about managed to get the window almost the fullway back up and now goes up and down but makes a crunchin noise does anyone know what this is and how to fix it i think it may just be a twisted wire in the pulley but the doorhas very limited access