A: It may have been bundled with freeware such as video converters, PDF creators, or download managers. Always use "Custom Installation" to avoid such bundling.
Because this is a kernel driver, do not delete the file manually. You will cause boot errors.
Correct removal steps:
If the uninstaller fails or is missing:
Clean up residual registry entries:
In 99% of documented cases, bfadi.sys is not a native Microsoft Windows file. You will not find this file on a clean, fresh installation of Windows 10 or Windows 11.
Instead, bfadi.sys is most frequently associated with:
Baidu Antivirus / Baidu PC Faster (International version) system32 drivers bfadi.sys
Because bfadi.sys filters every file operation, a buggy version can cause severe I/O bottlenecks, especially on HDDs.
A: No. It is a third-party driver. Windows does not include it by default. A: It may have been bundled with freeware