USB security: The program doesn't run

A 'Sentinel key not found' message box may be underneath other windows on the desktop.
Click Ok on it, insert the key, and run the program again.

Installing the Sentinel USB driver on a new PC

Purple only USB keys have a driver already with Windows, see 'Installing the USB security key' on the download page.

Black, or black and purple USB keys have a driver in the installation folder. This is needed when installing on a new computer for the first time:
  • Install the application as usual.
  • Open the application folder for example C:\Program Files (x86)\Biofield Viewer
  • Run the file called "Sentinel System Driver Installer 7.5.8.exe", and use the default options: Yes, Next, Modify, Next, Next, Install, Finish
  • Run the application as usual from its desktop shortcut.

    To run Biofield Viewer offline on computers without a USB key: see "Offline Edition" section on

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