wew

@mayuri: what month you buy windows 8? october? november? or january?

@jason: i know that jason, i already experienced that when using windows 8 trial at october. uncheck behavioral shield was the best option.
i download again windows 8 at january and what happen. no more black screen by avast.
that is my case, i dont really know what is the problem then if windows update cant help, sorry :-\