To Fix Sound Problem in Windows 7 , please try these two simple methods:

Method 1 : Please go to Control Panel and open ‘Device Manager’ – Locate “Sound, Video and Game Controller’ – Right click on your device’s sound card and click on ‘Update driver software…” – install the updates if available – if not, please right click on your sound card and then click ‘Uninstall’ – close all windows and restart your computer – After restart, Windows will automatically install the uninstalled drivers. And now check the sound.

If this didn’t work, please try this second method:

Method 2: Click on start menu – search for ‘Services’ – Open ‘Services’ and locate ‘ Windows Audio’ – right click on it and open ‘Properties’ – click on fourth tab ‘Dependencies’ and please note down the three services written there. And now, locate those three services in the list of services and right click each and select ‘Start’ if they are not started already. Now, double click on ‘Windows Audio’ service – change startup type to ‘Automatic’ and click ‘Start’ – ‘Apply’ – ‘OK’.

Hope It will help You.