device manager gihin balanna modem eka detect wela thiyanawada kiyala.. eka detect wela drivers install wela naethnam right click karala properties gihin details wala hardware id eka hoya ganna... e id eka copy karala google search ekak danna drivers walata.. ehema hoyala ena drivers install karanna berinam e drivers files koheta hari extract karanna... eeta passe device manager eke gihin device eke drivers update "manually" karanna. e kiyanne update drivers gihin browse my computer for driver software gihin ara drivers extract karapu folder eka denna... if you already got drivers try this method too...
cheers...