I spent five hours trying to upgrade a HP envy laptop from the pre installed windows 8 to the windows 8.1 download in the app store. I updated the bios and chip set drives from the HP website, I made sure the Windows updates were all up to date. I tried updating the video card driver and I doing the reboot for the setup of windows 8.1 the screen goes blank and eventually tells me the update failed. I did some research on the issue, everything I came across said it was a Graphic driver problem, I uninstalled the graph drivers and tried disabling the driver in the device manager, did a reset on the Microsoft store, disabled all the apps and tried to re install the update. I was able to watch the update go through the setting up of the files, but once the installation was about to reach the EULA agreement the screen goes blank and eventually the computer tells me the installation could not complete and the machine reverts back to the windows 8 installation. Any suggestions or idea's would be greatly appreciated.