This is meant to be an update to a current operating system, not a new standalone windows version. It absolutely should not involve procedures such as totally re-installing windows 8 etc. especially when this is still only a shot in the dark and may (probably will) not succeed.
The process of updating should normally be essentially transparent to the end user.
This is not the case for a significant number of previously fully functioning systems. The individuals coming to seek help here probably represent the tip of an iceberg of users who have failed to make the transition to 8.1.
At present there are multiple suggested strategies out there, none of which are routinely proven to work. In a few cases, Microsoft has been able to confirm a specific cause e.g. Steelseries drivers and some individuals have (mainly by luck) stumbled upon a solution that works, at least in part, for them.
Individuals have submitted logs, as you suggest above, with no sign that this has led to a resolution of their issue. They may well have also used the automated utility to supply information to Microsoft, as requested by Nirmal S in their post of 7th November.
The lack of any official update or recent input from Microsoft is disappointing. It is to be hoped that they are working on an update/s to correct the failures of the 8.1 install but there is no information forthcoming from them. It would be appreciated if there was a "sticky" official thread somewhere.
Meantime, the best strategy for most is probably to stick with 8 until an 8.1 update is delivered, rather than risk trashing or crippling your system by one of the multiple unproven/tested suggested pathways to be found in this and other similar threads.