Hello jibrankhan,
Thank you for posting on the HP Forums!
I understand that there is no sound from your right speaker. I will do my best to assist you! To commence troubleshooting, please try the steps in this HP document: No Sound from the Speakers (Windows 7)
These steps are designed to resolve your issue. Either way, please provide your results. Thanks again for posting on the HP Forums. Have a great day!
Mario