I have not found a fix. After running the Windows 8.1 Update from the store my computer will not boot unless In insert my recovery USB drive and try to repair. (The repair fails.) However after I power of the PC and remove the USB drive. The PC will boot correctly once. I would leave the PC on but it shuts it self off at night. (And yes I have checked my power profile, it is set to never.) The only thing I have found online is a possibly corrupt video driver. I uninstalled the video driver reboot and it did not fix the issue. Anybody have any suggestions? The PC is a HP EliteBook 8730w laptop. I had no issues with Windows 8 or the Windows 8.1 preview.