This Windows update error 0x800703f1 = The configuration registry database is corrupt.
Perform the following steps:
1) Open administrative command prompt (ACP) and type or copy and paste:
2) sfc /scannow
3) dism /online /cleanup-image /scanhealth
4) dism /online /cleanup-image /restorehealth
5) sfc /scannow
6) chkdsk /scan
7) findstr /c:"[SR]" %windir%\Logs\CBS\CBS.log >"%userprofile%\Desktop\sfcdetails.txt"
8) Findstr /c:"[SR]" "C:\Windows\Logs\CBS\CBS.log" > %UserProfile%\Desktop\Cbs.txt
9) When these have completed > right click on the top bar or title bar of the administrative command prompt box > left click on edit then select all > right click on the top bar again > left click on edit then copy > paste into the thread
10) Find the new text files on the desktop > zip as needed > post share links
11) Run setupdiag > post a share link including all files:
https://learn.microsoft.com/en-us/windows/deployment/upgrade/setupdiag
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