Win 7 updates failed - 80070643 and 80071A91

Windows Update fails to install any updates, and shows error codes 80070643 and 80071A91.
There are several threads about these errors, and I have read all of them.
I tried the Microsoft fixits 50123 and 50709.
I cleaned out .NET framework, and did cleanup
I tried Dockster's fix here www.sevenforums.com/windows-updates-activation/97775
I tried the "Set autoreset true" fix.

and then, after all that, I finally fixed it with...Checkdisk!

(My computer / local disk C: / right-click / properties / tools / check now / "Yes" to scheduled check)

I hope that by putting this all in one place, I can save someone a bit of trouble.

yep, tried that one too.
Two days of messing about with elevated command prompts before I thought to try the simple stuff!

I know this is an old post but THANK YOU!!! I had the two exact same errors and Check Disk fixed it perfectly. I spent a lot of time trying to figure this one out and finally stumbled upon this post.

Checkdisk worked for me too!

(Windows update error 80071A91 also 80070643)