Just a quick suggestion, try going into Device Manager and right-clicking on your sound card then disabling and re-enabling it. After that try re-booting your pc.
You could also try uninstalling and re-installing your sound card.
Fujitsu Lifebook P727 laptop review
Microsoft Paint set to die after 32 years
Mac power user tips and hidden tricks
Comment désactiver la saisie intuitive et paramétrer votre clavier ?