Eye tracker not working / throwing Windows errors.
Uninstall Gaze Interaction Software.
Uninstall Tobii Eye Tracking
Uninstall Tobii IS3/IS4 Driver
Delete the following folder:
C:\ProgramData\Tobii Dynavox\Gaze Interaction
Reboot PC.
Reinstall Gaze Interaction Software.
If problems persist, contact Link Assistive.