I've already got Win8.1 Enterprise x64 running on my system but I didn't do a fresh install when I switched from an AMD to Intel motherboard and it's quite cluttered anyway, so I decided to do a fresh install now to see if it clears up a few problems. I've only got one SSD and can't face running from HDD again but there's sufficient space on my SSD's 2nd partition (which I use for games) to create a VHD and install Windows in that, so that's what I did. I've installed the drivers from the Asus site for my Z97-A and all drivers that Windows Update finds and it boots fine after that but if I then install just the Security updates (as opposed to the Updates for Windows) it BSOD on the next boot. It's a pain using system restore to get it working again as well, as there doesn't seem to be anyway to access that from the Windows Boot Menu. I think I managed to once by pressing Shift+F11 but even after attaching the VHD with diskpart, it said it was unable to find the boot/recovery store (something like that anyway), so the only way I've found to do it is to use Virtualbox to attach the VHD and Windows DVD. It's also a bit annoying that whenever I select the VHD from the Windows Boot Menu it has to reboot my PC and then it boots into the VHD. It doesn't have to reboot when I select the 'normal' Windows. I don't know if it's because I boot into grub4dos first and then load the Windows Boot Menu with this: titleWin8.1 (SSD) unhide (hd0,0) root(hd0,0) chainloader/bootmgr but I don't really see how that could cause it, so I guess it's just how Windows works. Anyway, does anyone know if the KMS hack could cause Windows to BSOD after installing the Security Updates? I can't say exactly which hack it is I'm using, just that the ISO I'm using is "Win81AIOFeb2014.iso" and it offers KMS and non-KMS installs for all the versions of Win 8.1 to install.