I reposted this as

Solved Need help with setuperr.log on failed upgrades to Build 10586 - Windows 10 Forums

and got a solution.

Thanks for the tip. While it didn't directly solve my problem it did give me a lead which resulted in a solution.

I looked at the post by Rahul_compfreak you suggested. There was no entry under...

Thanks for looking at the error log. There were so many supposed "errors" listed that I had no idea which were temporary and resolved and which were fatal.

There is no SafeOS subfolder and thus no...

Since I installed Win 10 Build 10240 a few months ago Windows Update has been trying on an almost daily basis to upgrade it to the current Build 10586. While all other updates seem to have installed...

Since I installed Win 10 Build 10240 a few months ago Windows Update has been trying on an almost daily basis to upgrade it to the current Build 10586. While all other updates seem to have installed...

Thanks for the suggestion. However, I checked those settings and they appear to be OK.

Thanks, but I have checked carefully and my Date & Time settings are (and have been) correctly set to: UTC-5:00 Eastern Time (U.S. & Canada), and the Region & Language to United States.

No, it's not overclocked. The problem usually occurs on boot but I believe once occurred on wakeup. However, I guess I don't understand why either the BIOS or Windows 10 would show a correct time but...

I have a brand-new computer with a clean install of Win 10 which I've been using for about 10 days now. While the system time is always correct, every couple of days when I boot the system the date...