I have an Asus N61JQ laptop with Windows 8 Enterprise 64bit installed – same problems using Windows 7 X64 though.
Sometimes my Windows hangs when I shut it down by pressing the power button, and when I turn it on again, Windows hangs again. I mean windows starts up the after a short time then it hangs again! I thought it's because of the temperature of the CPU or one of my hardware components, but although I'm now using CoolPad with 2 fans, the problem didn't resolve itself. I also reinstalled my OS many times.
I checked my system hard drive using Ubuntu's Disk Utility and there were no problems. I checked my RAM using Fedora's RAM troubleshooter and it said the RAM was OK.
After Windows started up I checked Event Log but there was just a log saying that Windows shut down unexpectedly. It gave no more details about system hang.
I found out that my System hangs after installing an Optional (a Driver) Update. This is the name of the update:
Qualcomm Atheros - LAN - Qualcomm Atheros AR8131 PCI-E Gigabit Ethernet Controller (NDIS 6.30)
this is the question in microsoft answer