I just registered with this forum to relate to you the solution that worked for me to install KB3000580. Previously, on two Windows 8.1 computers, the update would not install, indicating a failure each time I tried, with no failure code. Here are the summarized system configurations:
Computer 1-
Windows 8.1
OS on HDD
Page file set to OS partition, automatically managed by Windows
GUI configured with Classic Shell
Anti-virus is Windows Defender
Computer 2
Windows 8.1
OS on SSD
GUI running under Stardock Start8 and WindowBlinds
Page File set 400min, 2000max on a non-OS partition, non-OS disk (lots of RAM)
Anti-virus is Windows Defender
After many update installation attempts on both computers through the Windows Update application and through manual installation attempts of the KB3000850, I only achieved installation failures. Here is what worked for both machines, in order of task performed:
- turn off all non-critical services via services.msc
- computer with Stardock Start8 and WindowBlinds - in Services.msc, disable Start8 and WindowBlinds/computer with Classic Shell - set Classic Shell to not start with Windows (bypass Classic Shell start menu)
- restart computer
- open a Command Prompt with administrator privileges, run sfc /scannow (it found OS corrupted files on both computers)
- manually install KB3000850 (use downloaded file from Microsoft)
- reboot (note, reboot took quite a while as Windows was configuring OS)
- turn back on services that where turned off during update preparation
- turn back on/enable full functionality of Start8 and WindowBlinds/Classic Shell
- run defragmenting software (or Disk Optimizer-TRIM for SSD)
The update on both computers was completely successful. The update is rather substantial. I recommend you do not skip the last step of optimizing/defragmenting the disk OS partition. After two or three reboots, both computers run just as fast as before the update, and there are no anomalies in any programs or applications. Boot-to-desktop is just as fast as before.