Windows Update errors

• 0x80070643A generic "installation failed" error. In 2024 it became famous because the KB5034441 security update failed with it on PCs whose recovery partition was too small. It also appears when Defender or .NET updates fail.
• 0x800f0922The update could not finish. The usual causes are a VPN or firewall blocking Microsoft's update servers, too little space in the System Reserved partition, or a failed .NET Framework 3.5 install.
• 0x80070005Access denied. Windows (or the installer) did not have permission to change a file, folder or registry key.
• 0x8024402cWindows Update cannot reach Microsoft's servers. A proxy, DNS or firewall setting is in the way.
• 0x80240034The update download failed or was corrupted.
• 0x80073712A file Windows Update needs is missing or damaged. The Windows component store is corrupted.
• 0x800f081fWindows could not find the files it needs to install an update or feature, most often .NET Framework 3.5.
• 0x800f0831The update needs a previous update that is missing or damaged, so it cannot be installed on top.
• 0x800f0988The update failed while cleaning up old components.
• 0x80070002The system cannot find the file specified. During updates it usually means downloaded update files are incomplete.
• 0x80070020A file is in use by another program, so Windows cannot replace it. Antivirus and backup tools are the usual cause.
• 0x80070422A service the update needs, usually Windows Update itself, is disabled.
• 0x8024200dThe update needs to be downloaded again; the copy on the PC is incomplete.
• 0x80070bc9A previous install is waiting for a restart before anything else can install.
• 0x8007371bOne or more parts of the update are missing from the component store.
• 0x80070070There is not enough disk space to install the update.
• 0x80240fffAn unexpected Windows Update error, often seen when the update server sends something the PC cannot handle.
• 0xc1900101A Windows upgrade (for example to a new Windows 11 version) failed and rolled back. It is almost always a driver problem.
• 0xc1900208An installed app is incompatible and blocks the Windows upgrade.
• 0xc1900200The PC does not meet the minimum requirements for the Windows version you are installing.