Clicking on"Start Playing Now" in the Fretlight Studio just minimizes the program to the Window task bar.
From Fretlight Knowledgebase
Please download and install Microsoft's free Visual Studio Express which is linked below. Once that is installed you will be able to see the Fretlight Player software.
http://www.microsoft.com/visualstudio/en-us/products/2010-editions/visual-basic-express
If you receive a "Pin" error message uninstall the 2010 version and install the 2008 version linked below.