Hello saltseawave,
I understand that your finger print reader s not working correctly.
Go to control panel, all Programs and uninstall the simple pass program.
Here is a link to reinstall the program.
If it has not been to long since the problem started, you can run a system restore.
This will take the system back to when everything was working correctly without affecting your personal files.
Here is a link on how to do a restore.
Let me know how everything goes