- Software and digital services
- Operating system
0xC1900101
0xC1900101 when upgrading Windows: a driver error during the upgrade
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
According to Microsoft, errors that begin with 0xC1900101 are usually driver errors. Unplug hardware you do not need, look for devices with errors in Device Manager and update third-party drivers.
Safety first
Stop and check this first
- A driver error does not mean the device is faulty: usually another driver, or unplugging it during the upgrade, is enough.
Safe checks you can perform
- Space and Windows Update several times
- Extra hardware and third-party drivers
- Device Manager
- Third-party security software
Leave these tasks to a qualified professional
- Do not attempt this professional task: Repair disk errors and do a clean restart
- Do not attempt this professional task: Restore and repair system files
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.
Repair disk errors and do a clean restart
What they doThe technician runs chkdsk to repair disk errors and performs a clean restart before repeating the upgrade.
They must show youchkdsk output and the list of disabled services.
In writingthe result of the retry and the item identified.
Restore and repair system files
What they doThey run the DISM tool to restore system files and retry the upgrade.
They must show youDISM output.
In writingwhat was repaired and whether the upgrade completed.
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.
Space and Windows Update several times
- Who:
- you.
- How:
- check you have at least 16 GB free on a 32-bit OS or 20 GB on 64-bit; then run Windows Update several times and install everything available, including drivers.
- Result that matters:
- whether the version upgrade completes after installing everything.
- If it completes:
- space or a prior driver update was missing.
- If not:
- continue with hardware and drivers.
- Evidence to keep:
- the exact code variant and free space.
Evidence: Microsoft Windows upgrade and installation errors
Extra hardware and third-party drivers
- Who:
- you, with the PC off.
- How:
- unplug unneeded external devices (printers, drives, USB flash drives, docks) and download driver updates from each maker's website for the devices you keep.
- Result that matters:
- whether the upgrade completes without that hardware or with new drivers.
- If it completes:
- a device or its driver caused the error.
- If not:
- check Device Manager.
- Evidence to keep:
- list of what you unplugged and drivers updated.
Evidence: Microsoft Windows upgrade and installation errors
Device Manager
- Who:
- you.
- How:
- open Device Manager and look for devices with a yellow exclamation mark; update their driver or uninstall a device you do not need during the upgrade.
- Result that matters:
- whether any device had an error.
- If one did and the upgrade then completes:
- that driver was the source.
- If none did:
- move on to security software.
- Evidence to keep:
- screenshot of the device with the error.
Evidence: Microsoft Windows upgrade and installation errors
Third-party security software
- Who:
- you.
- How:
- temporarily uninstall any non-Microsoft antivirus and keep Windows Security on during the upgrade.
- Result that matters:
- whether the upgrade completes without it.
- If it completes:
- reinstall a compatible version of the antivirus.
- If not:
- hand the case to IT support.
- Evidence to keep:
- antivirus name and version.
Reinstall your antivirus as soon as the upgrade finishes.
Evidence: Microsoft Windows upgrade and installation errors
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
- error 0xC1900101
- 0xC1900101 - 0x2000c
- 0xC1900101 - 0x20017
- 0xC1900101 - 0x3000D
- 0xC1900101 - 0x30018
- 0xC1900101 - 0x4000D
- 0xC1900101 - 0x40017
- C1900101
What it means
Microsoft says an error that begins with 0xC1900101 is usually a driver error, and lists variants such as 0x2000c, 0x20017, 0x30018, 0x3000D, 0x4000D and 0x40017. To fix them it suggests making sure there is enough space, running Windows Update several times, checking third-party drivers, unplugging extra hardware, checking Device Manager, removing third-party security software, repairing disk errors, doing a clean restart and restoring system files. The code does not name the driver.
Warnings and stop conditions
- Loweditorial warning
A driver error does not mean the device is faulty: usually another driver, or unplugging it during the upgrade, is enough.
Evidence: Microsoft Windows upgrade and installation errors
Symptoms and causes
Probable causes · in order
- Incompatible or outdated third-party driverCommon
This is Microsoft's general cause. Confirmed if the upgrade completes after updating or removing the driver.
Evidence: Microsoft Windows upgrade and installation errors
- Extra hardware connectedPossible
Microsoft asks you to unplug extra hardware; if the upgrade then completes, the device or its driver was the problem.
Evidence: Microsoft Windows upgrade and installation errors
- Third-party security softwarePossible
Told apart because the upgrade completes after temporarily removing it.
Evidence: Microsoft Windows upgrade and installation errors
- Lack of space or disk errorsPossible
If the upgrade proceeds after freeing space or repairing the disk, that was the cause.
Evidence: Microsoft Windows upgrade and installation errors
Virtual technician
Does 0xC1900101 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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