She opened ( Win + X → Device Manager ). Under "Other devices," she saw a yellow warning triangle next to "STM32 Virtual COM Port" or sometimes just an unknown device.
She quickly found the official source: the package on the STMicroelectronics website. She learned an important lesson: Always download drivers directly from the manufacturer (ST.com), not from third-party "driver download" sites.
After installation, the wizard asked her to restart her computer. She did. After reboot, Elena unplugged her STM32 board, waited 5 seconds, and plugged it back in.