How to Repair 0x800B0100 Error in Windows 10 and 11
The 0x800B0100 error is one of the most common Windows errors. It typically appears during Windows Update, system setup or when installing drivers, and it is usually caused by corrupted system files, blocked services or network problems. Follow the fixes below in order; most users resolve it within 30 minutes.
What causes the 0x800B0100 error?
The 0x800B0100 error usually points to damaged Windows Update components, incorrect system time, a full system drive or security software blocking the connection. Occasionally it follows a failed update that left services in a half-configured state.
Fix it now
1. Check your system date and time
A wrong system clock breaks secure connections and can trigger update errors. Set time and time zone to automatic in Settings > Time & Language, then sync.
2. Clear the software distribution cache
Stop the Windows Update service, delete the contents of C:\Windows\SoftwareDistribution\Download, then restart the service and try updating again.
3. Run the Windows Update troubleshooter
Open Settings > System > Troubleshoot > Other troubleshooters and run the Windows Update troubleshooter. It automatically detects and repairs the most common update problems.
4. Run System Restore
If the error started recently, restore Windows to a point before the problem appeared via Control Panel > Recovery > Open System Restore.
5. Temporarily disable firewall or antivirus
Some security suites block update servers. Briefly disable third-party antivirus and Windows Defender Firewall, retry the update, then re-enable them right away.
Related guides
Frequently asked questions
No. It is a software-level error that prevents an update or feature from running. It will not damage your files or hardware.
The fixes here keep your files. The Media Creation Tool repair reinstalls the OS, but it keeps your files and apps.
Most cases take under 30 minutes. SFC and DISM scans can take longer depending on disk speed.