The QMSL_MSVC10R.dll file should be located directly in the installation folder of the software you are using (e.g., the QFIL or Hydra Dongle folder).
If the library is installed but the error persists, use the System File Checker (SFC) to repair corrupted system components: Right-click the menu and select Windows Terminal (Admin) Command Prompt (Admin) sfc /scannow dll 39-qmsl-msvc10r.dll 39-
: The MSVC10R suffix indicates it was compiled using Microsoft Visual C++ 2010 (v10) Redistributable. The QMSL_MSVC10R