Hi alamgir_zett,
The reason why you are not getting sound and cannot use web cam is because of missing drivers. Please be informed that for this specific machine, Lenovo only released drivers which are compatible for Windows XP and Vista 32bit. Kindly visit this link for your reference.
DRIVERSIf you'd like to use again the sound and web cam of your system you need to restore the system to it's factory settings. I have provided a link that you can go to for the process.
Click here.Hope it helps.
Thank you for using Fixya.
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