0x80070306
Moderate
Microsoft · Windows
An installation error occurred during the update process. The update package failed to install a required component.
Quick Answer
Error code 0x80070306 on your Microsoft Windows means: An installation error occurred during the update process. The update package failed to install a required component.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Restart your PC to clear any pending update operations, then retry Windows Update.
2
Run the Windows Update Troubleshooter: Settings > System > Troubleshoot > Other troubleshooters > Windows Update.
3
Clear the update download cache: Open Command Prompt as Administrator, run net stop wuauserv, delete the contents of C:\Windows\SoftwareDistribution\Download, run net start wuauserv.
4
Run sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth to repair system files.
5
Check the Windows Update log for details: Open PowerShell as Administrator and run Get-WindowsUpdateLog. Open the resulting log file on your Desktop and search for 0x80070306 to find which component specifically failed.
6
Download the failing update manually from the Microsoft Update Catalog (catalog.update.microsoft.com) and install it using the standalone installer.
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
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