- Software and digital services
- Operating system
0xC1900107
Windows 0xC1900107: cleanup pending from an earlier attempt
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
The Windows upgrade stops because the cleanup of an earlier installation attempt is still pending. Restart the PC and run setup again; if that is not enough, use Disk Cleanup.
Safety first
Stop and check this first
- In Disk Cleanup, check what you tick before confirming: do not select the Downloads folder or other categories holding files you want to keep.
Safe checks you can perform
- Restart and run setup again
- Disk Cleanup including system files
- Enough free space
Leave these tasks to a qualified professional
- Do not attempt this professional task: Check the state of the earlier attempt
- Do not attempt this professional task: Microsoft support
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Check the state of the earlier attempt
What they doThe technician checks for pending setup operations and files from an earlier attempt and cleans them before relaunching the upgrade.
They must show youwhat leftovers were found and the state after cleaning.
In writingwhat was removed and the result of the new attempt.
Microsoft support
What they doIf restart and cleanup are not enough, Microsoft support is contacted with the code and the update history.
They must show youthe update history with the failed attempt.
In writingthe case number and the proposed fix.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Restart and run setup again
- Who:
- you.
- How:
- save your work, restart from Start, Power, Restart (closing the lid is not enough) and launch the upgrade or setup again.
- Result that matters:
- whether setup gets past the point where it failed.
- If it moves on:
- the pending cleanup was completed by the restart.
- If 0xC1900107 returns:
- leftovers still need cleaning.
- Evidence to keep:
- time of the restart and the point where it stops.
Evidence: Microsoft Windows upgrade and installation errors
Disk Cleanup including system files
- Who:
- you, with an administrator account.
- How:
- open Disk Cleanup for the system drive, choose Clean up system files and tick the temporary files and previous installation files; confirm and restart.
- Result that matters:
- whether setup starts again without the error.
- If it starts:
- leftovers from the earlier attempt were blocking the upgrade.
- If it persists:
- the case goes to a technician or Microsoft support.
- Evidence to keep:
- screenshot of the selection and the space freed.
Evidence: Microsoft Windows upgrade and installation errors
Enough free space
- Who:
- you.
- How:
- in File Explorer, This PC, check the free space on the drive with the Windows logo.
- Result that matters:
- whether you have at least the 16 GB (32-bit) or 20 GB (64-bit) Microsoft asks for to upgrade.
- If not:
- free space before retrying.
- If you do and the error remains:
- space is not the cause.
- Evidence to keep:
- screenshot of the free space.
Evidence: Microsoft Windows Update troubleshooting
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Software and digital services
- Brand
- Microsoft Windows
- Product type
- Operating system
Known code variants
- 0xc1900107
- C1900107
What it means
Microsoft explains 0xC1900107 as a cleanup operation from a previous installation attempt that is still pending: setup needs a restart to finish it before continuing with the upgrade. If restarting does not solve it, Microsoft says to use Disk Cleanup to remove the temporary files and system files left by the earlier attempt. The code does not point to damage in Windows or the PC: it signals leftovers from a previous installation.
Warnings and stop conditions
- Loweditorial warning
In Disk Cleanup, check what you tick before confirming: do not select the Downloads folder or other categories holding files you want to keep.
Evidence: Microsoft Windows upgrade and installation errors
Symptoms and causes
Probable causes · in order
- Restart pending after an earlier attemptCommon
Confirmed if setup moves on after a full restart of the PC.
Evidence: Microsoft Windows upgrade and installation errors
- Temporary files from the earlier installationPossible
If the error stays after a restart, Microsoft points to leftover temporary and system files that need cleaning.
Evidence: Microsoft Windows upgrade and installation errors
- Not enough free space for the new installationPossible
You can tell because the system drive is nearly full; cleanup also frees the space Microsoft asks for.
Evidence: Microsoft Windows Update troubleshooting
Virtual technician
Does 0xC1900107 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Microsoft Windows upgrade and installation errors
Microsoft · 2026 · official_doc
- 2
Microsoft Windows Update troubleshooting
Microsoft · 2026 · official_doc
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