Hello: I just bought a new machine, it has a i7 4770 3.4 ghz, motherboard is a gigabyte H87-hd3, 16 gb kingston ddr3 memory (2 x 8GB) and a hard drive samsung 840 256gb solid. do the installation of windows 8.1 and perfect, but on the first reboot crashes in less than half an hour is frozen. I fail to install the drivers and the team because I can not. It happens exactly the same with windows 8 (always 64 bits). I tried to do an installation of windows 7 and the pc runs smoothly ... I can install the drivers, updates, navigate, and without any kind of problems ... Seeking information I have seen that is a problem for overclocking, but nothing changed. also say it is a c-state problem in the bios, but nothing. The pc has me very confused ... someone help me?