Issues with downloading files, particularly browsers like Chrome and Mozilla, can stem from interference by antivirus and firewall software. Users have reported receiving a "download file failed verification" error code (0x80040204) when attempting to download. This error often indicates that the security software is blocking the download process. Disabling antivirus and firewall settings can resolve the issue, but users may need to ensure that all components are fully disabled, as some parts may remain active. Restarting the computer in safe mode can help eliminate background processes that interfere with downloads. In some cases, malware or adware may also be a factor. Users have successfully downloaded files after disabling their antivirus software, highlighting the need for careful management of security settings during downloads.