I recently installed build 10159. It seems to work fine except for the fact that the desktop back ground is all black. I right clicked and chose "Personalize" to get a different background. But it gave me a message telling me that I cannot personalize until I activate Windows. So I went into Settings and clicked on Activation. Then a message popped up saying that it couldn't activate now and to try again later. I tried several times but got the same message.