We have two 64-bit Windows 10 installations; one on an almost new i5 desktop and the other on a 2009 Dell Studio laptop. Whilst Windows 10 Version 1511 OS Build 10586.36 works OK on the desktop PC, on the Dell laptop there's no Internet connection if I try & install the same version / build. It comes up with the error message: "One or more network protocols are missing on this computer". I have tried installing it twice, but get the same error / no connection both times. The network function reports that IPv4 is connected to the Internet but that IPv6 connectivity has no network access. Does anyone know how to fix this error? For now, I have re-installed the previous version from the image I fortunately made a couple of weeks ago and set Windows 10 to accept critical updates only. As soon as this was installed, the laptop jumped back into life. Once again, it is an example of lack of full testing at Microsoft!