I have installed OS Vista for GX270. Now sound driver not supports to this OS. Is there any sound driver available to upgrade? Please help to resolve this issue.

Thanks,

Not that I am aware of. I have done the same thing with that same machine setting it up to be a dedicated DVR. You will find Windows 7 Support is no better either for it. What you find on Dells website for drivers is all you will find. You have an option of using a USB sound device that simply plugs into a USB port... does have Vista support and some can be had for less than $20. There are various brands and vendors to choose from based on what you want.

I have since gone back to Windows XP on that machine due to instability I had with Vista on it, and I had even worse problems with Windows 7 on that hardware. And I do like Windows 7 on my main computer (different compatible hardware in that case).

Every version of windows has backward compatibility. Download the driver, right click> properties> compatibility> than pick xp service pack 2. worked for me!