I am having alc660. I recently installed windows 7 and found out that my sound was crackling. I am not having any problem with my hardware I checked them on linux. they are working fine. I have used the microsoft default drivers and also the realtek drivers. None of them fixes the problem. I even tried to increase sound priority but it shows access denied. If some one has the solution to this problem please help me out. I dont want to remove windows 7 from my laptop.