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I have laptop Sony vaio vgn-ar61mr

It has video card nvidia 8400m gt

It has Windows 7 (originally Windows Vista was installed)

Few weeks ago video acceleration stopped to work. Its video is recognized as VGA. When I install NVidia driver downloaded from NVidia website then it tells there no compatible hardware. Install NVidia driver

Device Manager

enter image description here

All 3D apps stopped to work. I tried many things except Windows re-install. It would be hard to get all software installed back.

UPDATE

I was able to install driver from Sony UK website

http://www.sony.co.uk/support/en/product/VGN-AR61M/updates

There is Vista 32bit and it worked on Windows 7 32 bit as well.

It improved performance but I still willing to install original NVidia drivers. They do not install with same error.

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did you try to do that automatic driver update, and not that manual selection atleast once? –  Sickest Sep 22 '13 at 18:51
    
Yes. It was first what I did. –  Max Sep 22 '13 at 18:54
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how old is this laptop? –  Sickest Sep 22 '13 at 18:56
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@Max You said you've tried other driver versions. The one on the screenshot is fairly old. Have you tried version 327.23? –  happy_soil Sep 22 '13 at 19:00
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Check the BIOS if it sees the video card. If it doesn't, then chances are that it's malfunctioned like @Sickest said. –  happy_soil Sep 23 '13 at 9:00
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1 Answer

I'm pretty sure your video card hardware has malfunctioned, if you've tried a number of drivers and the laptop being that old. Video card driver don't just randomly disappear like that.

you could try to find a nvidia driver cleaner, where it finds any scattered files or drivers and removes them, then try installing again, but i doubt that's going to work.

your last resort is to reinstall windows and see if maybe windows is corrupted somehow. or revert to an older system resort point if you have that activated.

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