it is also saying i'm missing important security and quality fixes, but i think i read that this may be a false alarm from somewhere.
Is your PC enrolled in the Windows 10 Extended Security Updates | Microsoft Windows program?
error 0x800703fa
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(134.4, 71%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ET%3C/text%3E%3C/svg%3E)
toni
0
Reputation points
I've tried updating my windows, but it gets stuck at 9% and has to roll back changes. I have tried pretty much everything i could find on the internet.
my win ver is: 19045.3803
https://learn.microsoft.com/en-us/answers/questions/5526946/how-to-fix-error-0x800703fa
seems like the exact issue as in here. i've ran mct but it seems to have failed, as i still get the same error. However, in this case they just reinstalled windows, but i'd like to wind a solution where i don't have to do that.
stuck at update KB5066791.
Heres a link to setuplogs from onedrive. If i did it right. Seems like panther and rollback dont have any files in them even when i have them on my c:
https://1drv.ms/u/c/ef76caaa71dc239e/IQC1adyRckUhToKTsjovfqvoAeoORWRYFI1qXeJYVV1hU-0?e=ScSvXz
Windows for home | Windows 10 | Windows update
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Ramesh 180.9K Reputation points Volunteer Moderator2026-09-06T15:46:09.8+00:00 Seems like panther and rollback dont have any files in them even when i have them on my c:
Maybe the files were in use, so they couldn't be copied. Please share the two folders manually.
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toni 0 Reputation points
2026-09-10T10:25:50.1133333+00:00 https://1drv.ms/f/c/ef76caaa71dc239e/IgBuisN4QwwHTYsbWAH-RJAMAXuutYL4qiJBtTMrqKo98kc?e=CspYbd
heres panther file. sorry it took so long. i did not see any updates.
i could not find rollback file at c: and while trying to get setuplogs today. things are still empty. -
toni 0 Reputation points
2026-09-10T10:31:18.33+00:00 https://1drv.ms/f/c/ef76caaa71dc239e/IgABkZ4wcFkeRJf3C9Mos2N_AZ6vrIjMh3NAQsf0Wi0cOg0?e=5NG3vx
found rollback inside panther files
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Ramesh 180.9K Reputation points Volunteer Moderator
2026-09-10T10:32:44.58+00:00 If you have any of the following programs, please uninstall them:
FACEIT FACEIT Anti-Cheat Vanguard Valorant Anti-CheatReference: Errors 0x800703fa and 0x80071a2d when installing Cumulative Update
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toni 0 Reputation points
2026-09-10T10:57:36.7933333+00:00 that did indeed fix the problem.
i do have a new one. It now says my version of windows has reached end of support and wont be getting new updates even when i have windows esu.
it is also saying i'm missing important security and quality fixes, but i think i read that this may be a false alarm from somewhere.
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Answer accepted by question author
Ramesh
180.9K
Reputation points
Volunteer Moderator
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toni 0 Reputation points
2026-09-10T11:07:43.0466667+00:00 it should have been, but i guess it isn't. Is there a way to check?
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Ramesh 180.9K Reputation points Volunteer Moderator
2026-09-10T11:09:23.7933333+00:00 See Windows 10 Extended Security Updates | Microsoft Windows
Do you see the Enroll option?
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toni 0 Reputation points
2026-09-10T11:13:04.5433333+00:00 i have downloaded the esu licensing preparation package, but i do not see any enroll option.
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Ramesh 180.9K Reputation points Volunteer Moderator
2026-09-10T11:14:28.83+00:00 See "Windows 10 ESU prerequisites" in that link.
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toni 0 Reputation points
2026-09-10T11:24:13.1733333+00:00 it took awhile, but i finally got windows to download esu updates. all good now. For some reason it did not show up anywhere.
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Ramesh 180.9K Reputation points Volunteer Moderator
2026-09-10T11:25:31.1666667+00:00 Great. What's the current OS build number?
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Ramesh 180.9K Reputation points Volunteer Moderator
2026-09-10T14:22:05.8166667+00:00 It's up to date.
If all is resolved, feel free to mark the answer for this thread. Otherwise, please let me know if there's anything else I can help you with.
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2 additional answers
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Ramesh 180.9K Reputation points Volunteer Moderator
2026-09-10T11:00:22.19+00:00 it is also saying i'm missing important security and quality fixes, but i think i read that this may be a false alarm from somewhere.
Are you enrolled into the ESU program?
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TaoLi 110.6K Reputation points Independent Advisor2026-09-06T14:04:58.2333333+00:00 Hi
I checked your SetupLogs.zip. The Panther and Rollback folders are empty, and SetupDiagResults.txt is also blank. CBS.log records 0x800703FA, but it does not include the failure details needed to identify the cause.
Please manually copy the following into a new folder on your desktop, accepting any administrator permission prompts:
C:\Windows\Logs\CBS— the entire folder, including CbsPersist files.C:\Windows\INF\setupapi.dev.logC:\$WINDOWS.~BT\Sources\PantherC:\$WINDOWS.~BT\Sources\RollbackYou can paste these paths directly into File Explorer’s address bar. Compress the copied folder into a ZIP, check that it contains files, and share it through OneDrive. If copying fails, please share the exact message.
Microsoft’s setup log locations: https://learn.microsoft.com/en-us/windows/deployment/upgrade/log-files
These logs should help narrow down a repair that preserves your files and apps.
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toni 0 Reputation points
2026-09-10T10:34:14.7066667+00:00 https://1drv.ms/u/c/ef76caaa71dc239e/IQBDacAoQA6KSp-xlWSsoxTkAUGEdXt1CrpkgAJwKYCrtF0?e=mqfdKg
heres cbs and setup. panther and rollback could not be found while pasting those links to to address bar. i have added files with same names as a response to ramesh
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