error 80004005

The error 80004005 is a common Windows update or upgrade failure code, often encountered during Windows 10 installation. In one reported case, the download and preparation phases complete successfully, but the actual upgrade fails immediately after reboot, triggering a rollback. This suggests a compatibility or configuration issue at the start of the installation process. Potential causes include third-party antivirus software, such as Comodo AV, which may interfere with the upgrade even when disabled. Troubleshooting typically involves disabling non-Microsoft security tools, checking system files, and ensuring sufficient disk space. The error may also relate to driver conflicts or corrupted update components.