Windows Update error 0x800f0805 is a common issue that users may encounter when trying to install updates on Windows 10 or Windows 11. This error can prevent the system from installing important updates, which can lead to security vulnerabilities and decreased system performance. The error might occur due to several reasons. One of the most common reasons is insufficient drive space. If your Windows drive (usually the C drive) does not have enough space to install Windows updates, this error may occur. It is recommended to have at least 32 GB of free disk space before installing the update. Another reason could be corrupted or missing system files. A corrupt operating system installation can cause error 0x800f0805. This could be due to damaged parts of the hard drive that may contain viruses and malware. The error can also be triggered due to a non-functional Windows installation key or the Windows Update feature. A poor or unstable internet connection can interfere with the update process and cause this error. Some third-party applications, especially antivirus software, can interfere with the update process and cause this error. Outdated system drivers can also cause this error. Sometimes, the updates themselves may contain bugs that prevent them from being installed correctly.
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