FTK Imager relies on a kernel-level device driver (commonly ad_driver.sys ) to perform its core functions, such as accessing physical drives, mounting forensic images, and performing memory dumps. The error occurs when Windows is unable to communicate with or load this essential driver. This is often due to modern security features in Windows, permission issues, or conflicts with other software.
: If you are using Windows 10 or 11, the Core Isolation feature might be blocking the driver. Open Windows Security . Go to Device security > Core isolation details . Toggle Memory integrity to Off and restart your computer. ftk imager could not start driver