Checklist
- Is DirectX installed?
- Is .NET 3.5 installed?
- Does your microphone and headphone (speakers) work with Skype when you are not using Skype Sidetone?
- Is your microphone and speakers set up, in Windows Sound and Audio Devices Control Panel, to be the default microphone and speaker devices? (not the default recording microphone and speaker)
- Is the mute checkbox for your microphone cleared in the the Windows Audio Control Mixer?
- Have you registered the Skype4COM dll?
- Have you given Skype your approval to allow the Skype Sidetone program to run?
- Have you given the Windows Firewall exceptions for Skype and the Sidetone, to allow the programs to connect?
- Have your tried talking into the microphone during a test call, with the Skype Side tone volume control set high? Is the checkbox checked? (When in a conversation, I believe most people will find that the slider set to just below consciously audible is the most comfortable.)