Rare noise on pavilion dv7

Hi every1,
I have a pavilion dv7-4065dx, it was working good, but last days every time i play a video or any song i hear a noise like a mosquito , this noise appears during 1 or 2 seconds every 30 seconds in a song or a video, also this noise lags the video.
Well, searching in google i've read people with the same problem and they said that they fixed this problem updating the bios , but i do not what to do , because i'm a bit scared of updating the bios.
Help me please, thank you.
Sorry for my bad English.

Hi,
If you have MediaSmart software installed on your notebook, the volume OSD ( on-screen display ) is provided by HP MediaSmart SmartMenu - you can download and reinstall this application from the following link.
http://ftp.hp.com/pub/softpaq/sp45001-45500/sp45140.exe
When the installation has completed, restart the notebook and let Windows fully load before checking if it now functions correctly.
Regards,
DP-K
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Welcome to the HP Forums!
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YoureInMySpot wrote:
I've been doing a lot of research lately, to mostly no avail, about whether or not my HP Pavilion dv7-7025dx laptop can have a dedicated GPU added to it, as currently it only has the integrated Intel HD 4000 Mobile graphics card.
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My laptop is the HP Pavilion dv7-7025dx Entertainment Notebook.
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