HP Pavillion G7 laptop
Intel i3 core
6GB ram
Intel HD Graphics 4000
I had updated successfully to 8.1 long ago from 8. Had numerous software problems beginning a couple months ago. My photoshop CS6 ceased to operate. I am pretty certain an update had gone wrong and messed up my OS. Did a clean install of win 8,, Photoshop cs6 worked again, and proceded to update to 8.1 with no luck. tried more than a dozen times.
I tried a different approach based on what I had read on this list and others. It didn't work, running the 8.1 upgrade assistant, installing from a clean boot, reinstalling all my drivers. Looked at your method and decided to start with your list...and then add mine.
. run sfc /scannow
. checked for windows updates,
.deleted avast antivirus, disabled windows defender,
.ran CC cleaner pro and deleted all my cache, temps, old prefetch. Ran CC registry cleaner.
.Ran windows 8.1 upgrade assistant to check for compatability problems which told me to
update the driver for the network adapter to Ralink RT3290 wi fi adapter. diid not restart.
proceeded to set up for a clean boot, but did not restart.
went to Microsoft store and downloaded the 8.1 and let it install.
I was shocked when it completed the install. It is working properly and I am very happy.
Windows 8.1 upgrade assistant
http://windows.microsoft.com/en-us/windows-8/upgrade-assistant-download-online-faq
Clean boot
http://support.microsoft.com/kb/929135
Thank you Kevin