The “Burn to disc” option is only available when the burner detects a Blu-ray/DVD writer/burner on your PC. If you don’t install a Blu-ray/DVD writer/burner on your computer, the “Burn to disc” option will appear grey.
Alternatively, you can choose ‘Create Blu-ray/DVD image file’ so that you can burn the converted Blu-ray/DVD to disk later with a third-party burner.
This FAQ is about: Frequently Asked Questions, PowerPoint to DVD Pro, PowerPoint to DVD Standard