What you’re seeing
- The upgrade to a newer Windows 11 version restarts several times, then rolls back.
- An error message referring to 0xc1900101, often with an extra code such as 0x20017 or 0x30018.
- The PC returns to the old Windows version as if nothing happened.
- The upgrade is offered again later and fails the same way.
Common causes
Every environment is different, but these are the causes our engineers find most often:
- An outdated or incompatible driver, often for storage, graphics, Wi-Fi or a docking station, crashes during setup.
- Third-party antivirus or encryption software blocks the upgrade from replacing system files.
- Low free disk space prevents setup from completing the migration.
- Connected USB devices or peripherals load drivers that fail in the new environment.
- Firmware or BIOS on the PC is too old for the new version.
Why it matters
Every Windows 11 version has an end-of-servicing date, and a PC that can't upgrade will eventually stop receiving security updates. Repeated failed upgrades waste hours of downtime, and staff often lose time waiting through multiple restarts. Running mixed Windows versions across the office also makes support and security harder to manage.
How AskTechGurus fixes it
Skip the trial and error. A certified engineer works on your actual system, finds the root cause, and fixes it properly.
Tell us what’s happening
Submit a ticket in about two minutes. Paste the error, describe what changed, and pick your tier. No charge to submit.
A certified engineer diagnoses it
A vetted, US-based systems engineer claims your ticket, usually within minutes during business hours, and investigates over a secure remote session you can watch and end at any time.
Fixed and verified with you
The engineer resolves the root cause and confirms with you that it’s working. You don’t just get a workaround, and you get a plain-English summary of what was wrong.
Pay only when it’s resolved
Fixed price from $99, invoiced only after you approve the fix. If it isn’t resolved, you don’t pay.
Frequently asked questions
Is my PC damaged because of this?
Not normally. The rollback protects the existing installation, so the PC keeps working on the older version.
Can we just stay on the older version?
For a while, but each version eventually loses security support. Staying too long leaves the PC exposed.
Can you get the upgrade to succeed?
A certified US engineer can find the blocking driver or app with you over a remote secure session, from $99, and you pay only when it's resolved.