Hi annie,
try the following methods:
Set up microphone
Type microphone in Windows Start Search box > Click Set up a Microphone > Select required type of microphone (for internal mic, select Others) > Follow the onscreen directions to set it up
Please try these options one by one and check after each option.
Run Hardware & Devices / Audio Troubleshooters
Type Troubleshoot in Windows Start Search box > Click Troubleshoot >
A. Click Hardware & Devices > Run the Troubleshooter
B. Click Playing Audio > Run the Troubleshooter
C. Recording Audio > Run the troubleshooter
D. Speech > Run the troubleshooter
Take actions related to Audio Driver
Windows Key+X > Device Manager > Sound, Video & game controllers > Right Click on the entry below > Properties > Driver Tab >
A. Roll Back - If Roll back driver is enabled, roll it back
B. Uninstall - Uninstall Device and restart to reinstall it automatically
C. Download and reinstall the driver from computer manufacturer's website
Visit this page for further reference: https://support.microsoft.com/en-sg/help/403488...