Uninstall the product

In Add/Remove Programs of Control Panel or through start button to find uninstall shortcut in PacketBone-> BoneLight program menu folder.

Please notice usually there will be prompt for bonelight.dll or blpreview.exe cannot be deleted. This indicates  the dll is still being loaded by explorer.exe, so if you want to clean the file completely, you may kill explorer.exe and click "Retry". Otherwise just continue and finish the uninstall.  The setup will request a reboot for a complete clean, the rebooting is required if you want to setup a new version of BoneLight.