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Running v4.4.1 farkles Windows Update on Win10 w/ 0x80070643 error

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jhvance:
I have 2 Win10 Home laptops on which I yesterday ran overnight the latest version of the all-in-one repair tool (something I do 2-3 times/year) after their regularly weekly battery of malware scans, and today cannot successfully update the OS to install the latest Windows Defender definitions -- it now consistently fails with that 80070643 error message, implicating the TwAI1 app.  I've followed a number of the MS-provided suggestions (namely opening a Powershell window with administrative privileges and running the SFC, DISM and CHKDSK tools within before rebooting) without regaining full function, searched for non-MS advice without finding any magic bullets and so thought I'd post a problem description here to see if there were other sage bits of advice which might be offered by the app cognoscenti. :omg:

Both laptops had no problems with the round of Patch Tuesday updates last week, have generally been kept up-to-date in all other respects, and both have the 64-bit OS flavor (one is build 1803, the other 1809).  My first inclination is to go back to the restore point I'd set before launching TwAI1 and see if that resolves the issue, but want to start a thread and then provide updates as I try that on each machine.

Boggin:
I would try your restore points.

jhvance:
Unfortunately, although I made certain to establish backup and restore points within TwIA1 before kicking it off on each machine, neither one now recognizes that it did that and finds no previous restore point at all. :angry:

Boggin:
It's been found that when you use the program to create a restore point, while it says it has, it hasn't.

I've reported that to Shane, but it doesn't appear to have been addressed yet.

There is another back up which the program auto does before starting the repairs and that is accessed from within the program under Backup Tools.

Click on Restore under the Registry Backup then click on Registry Restore and use the dropdown to select the dated back up and hit Restore Now, but did you not have any other restore points to choose from ?

jhvance:
There were exactly two registry backups from yesterday (and none earlier), so I toggled the first and had the program restore it, then rebooted and tried WU -- no joy with the 1st candidate, same error citation.  The 2nd candidate has gone into a chkdsk-at-boot cycle that seems to have reached a plateau at 10% complete.

There was no system restore point in the 1st candidate to select, despite the fact I had the app create one before launching it for its automated run and shutdown.  I haven't yet been able to check that feature in the 2nd candidate because of the stalled disk check.

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