No Sound and YTube videos are not playing - Says Error in loading

I have recently been experiencing a lot of problems on my pc. The main one is that the fan appears to be failing, as it is making a long continual noise.
I now appear to have lost the sound. I am not sure what is causing this, but have run through all the tests on your guides etc. Not sure if a system restore to an earlier date caused this or is required.
My product numebr is WF649PA#ABG
Model - DV6-2120 TX
Many thanks,

Hi happygirl2
I think you could try cleaning out air vents, cleaning the system with antivirus software as waqar_kamboh posted.
This is your product specs I suppose: http://h10025.www1.hp.com/ewfrf/wc/document?docnam​e=c02033034&tmp_task=prodinfoCategory&cc=us&dlc=en​...
Here is your product service manual: http://h10032.www1.hp.com/ctg/Manual/c01860375.pdf
Read through it know how to remove back cover of your laptop containing 7 air vents for air flow & clean it with dry clean smooth cloth/cotton. Clean the side air vents & wipe off any dust or dirt off any. Follow strict electro static protected state before opening the back cover as given in the manual.
Download and save all the latest drivers INCLUDING BIOS/FIRMWARE for your system by entering the Operating System installed onto your system from the following link. Install everything at the end & restart.: http://h10025.www1.hp.com/ewfrf/wc/softwareCategor​y?swlinkmsg=100&cc=us&dlc=en&docname=bph07165&lc=e​...
Also I advice you to do a hard reset to remove all electric potentials in the capacitors inside the system too.
Hope this helps.
thanks,
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