1. Right click on the volume control icon in the system tray (next to the clock), select Recording Devices.
2. Select your microphone from the list of devices.
3. Click Set Default.
If your microphone isn't listed, you might need to install some drivers for the motherboard. If it's too quiet, repeat steps 1 and 2, then click properties instead and you can tweak sensitivity, boost, etc.
have tried your advice and a message comes up saying that no audio device is installed, but my speakers work, please can you help