Audio driver for vaio PCG-GRT55/B

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I just installed windows 7 on my sony Vaio PCG-GRT55/B labtop.Initially it had windows XP. After I downloaded the windows 7, the laptop drivers went down.I already solve the ethernet driver problem.May someone pls help me solve the audio driver problem.I need to upgrade the audio driver but dont know how.Please help

 

[scout_03]

this is a japanse model you could find on the next link http://vcl.vaio.sony.co.jp/support/note/pcg-grt55b.html and the graphic card is nvidia ge force 4 420 go/32m

 

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Thanks Scout.Problem is solved

 

[scout_03]

put resolve on your tread

 

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How can I put resolve on my tread?

 

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Best answer selected by angle.