Actually, I am one of the many years of Windows and Microsoft fans. But this update has my anger kindled, because it does not work with certain CPUs: I have an AMD Athlon 64 X2 6000+, which I bought in 2008 (3.5 GHz per core) and Microsoft refused to upgrade to 8.1 / 64 .... Very annoying as well as the error code (0x101-0x20017) one can stand completely in the rain, because no explanation is connected with the fact that the CPU of the reason for non - install the operating system is. Only painstaking and frequent installation tests or research on the Internet have given me insight into the true cause. This is incomprehensible and arbitrary to not express myself differently for me. And many lost hours by an unsuccessful installation ... So Attention: Before buying this update, please check if your CPU is actually supported. I hope this information is helpful. I have received too late.