Requested data was missing from the Windows Update data store. The identifier alone does not establish a user-specific cause or a failed part.
Protect your files first
Back up important files when possible. If the drive is encrypted, locate the BitLocker recovery key before recovery changes. Stop if storage appears to be failing or this is a work or school managed PC.
What this code tells you
Requested data was missing from the Windows Update data store.
This is a researched code brief, not a confirmed diagnosis for your PC. Verify the exact code and any device-specific action against the official references below.
The next useful clue is the exact screen, app, device, or log where it appeared. Record the Windows build and what changed just before the error. Do not treat a matching number from another error family as the same problem.
Check the context
The useful investigation focus is update cache and data store state.
- Does Windows start normally, only in Safe Mode, or not at all?
- What Windows build and device model are affected?
- What changed before the problem appeared?
- What exact error text, driver name, KB number, or Event Viewer provider accompanies the code?
Safer checks to try
Record the exact error and when it happened Low risk
- Copy the full code, text, Windows version (winver), and any driver name shown.
- Note whether Windows boots normally, starts only in Safe Mode, or does not boot.
- Record what changed immediately before the issue and any relevant log timestamp.
After this check, see whether the original error appears again. If it does, record the new timestamp and continue with the next evidence-based step.
Use the supported Windows Update troubleshooting path Low risk
- Open Settings > System > Troubleshoot or Get Help for the Windows Update troubleshooter where available.
- Check Update history and record the failed KB number and complete HRESULT.
- Do not delete SoftwareDistribution or catroot2 folders automatically; reserve advanced reset procedures for qualified review.
After this check, see whether the original error appears again. If it does, record the new timestamp and continue with the next evidence-based step.
When to stop
Back up data and locate any BitLocker recovery key before advanced recovery steps. Stop for unstable storage or signs of electrical damage.
If Windows will not start repeatedly, the drive is unstable, or the device belongs to work or school, ask the appropriate manufacturer or IT team for help. Do not share a BitLocker key, product key, password, or full memory dump in a public search box.
Keep track of your checks
This checklist stays in this browser session. It is not sent to WinErrors.