I have a laptop model pcg-8m3m and i lost the sound audio

Here's the download link for the drivers of your Sony PCG. Click Here( VAIO PCG)

You can select the Operating System and download away your drivers.

In case you just need the realtek AC97 Audio drivers - you can download and click here ( AC97 Audio)

(Source- Fixya Ichiro)

Go here and select your model number to download the drivers you need:
http://esupport.sony.com/US/p/select-system.pl?model_type_group_id=10

select your model from here:
http://esupport.sony.com/US/p/model-find.pl?mdl=pcg-6e1m&PRODtype=32,33,127,63,71,118,7,102,26,80,119,72,125,44,55,27,74,84,57,108,115,109,103,89,113,35,142,78,48,77,106,29,133,123,50,39,64,138,114,41,12,58,52,81,137,60,45,66,73,101,76,86,62,54,67,70,139,129,68,2,17,1,88,136,116,141,100,82,110,25,128,28,120,83,134,135,69,59,112,49,24,140,104,124,130,131,53,122,79,121,143,42,46,13,105,126,6,85,3,36,51,9,111,47,38,4,34,132,43,117,5

and download the driver...

Device Type: Sound Card
Manufacturer: Sony Electronics
Model: Sony VAIO VGN-B55G or PCG-5B5P
Operating System(s): Windows® XP
ADI SoundMAX® Audio Device Driver @ http://esupport.sony.com/US/perl/swu-download.pl?mdl=VGNS170&upd_id=1571&os_id=7

Hope it helps.

go to this URL:
http://esupport.sony.com/perl/select-system.pl?DIRECTOR=DRIVER&PRODTYPE=1,24,26,66,9,70,5,72&template_id=1&region_id=1

look for the driver you need by model number.

i want to download all drivers for sony vaio laptop pcg-7m1m

Go to the Sony WEB site to their support/download page.
Download the appropriate XP or Visa audio driver for your model laptop.
Details as follows :-
http://esupport.sony.com/US/perl/select-system.pl?DIRECTOR=DRIVER

u have install proper driver of your sound card

Cable3,

Sounds like you indeed have a problem with an audio hardware driver. Presumably the 'Audio Device on High Definition Bus' is the system detecting a device it doesn't have a driver installed for.

First question - was the sound working previously? If so, did you recently install any type of audio software not related to the sound device itself?

Please provide the exact model number of the VAIO notebook and we can point you to the correct driver and try that for starters.

If you go into control panel/system the hardware tab then device manager is the re any yellow marks there to show something isnt installed?