Where can I update my computer so I can run the Fretlight software correctly?
From Fretlight Knowledgebase
Please go to the below link and select all of the items in the "Runtimes" section and then download and install.
Ninite: [1]
Please also download and install the latest version of DirectX from the link below.
DirectX: [2]
Please install the below software to update your computer's Codec.
K-Lite: [3]