I am having Sony Vaio that is running windows Vista very well and plays Blu-ray DVD's. I recently upgraded vista to Windows 7 and now I am not able to play Blu-Ray disks. Win DVD fails with error "Stop", Arc Soft Total Media Theater also fails and Cyber Link Power DVD says that "Playback stopped because your graphics card driver is incompatible" So I reinstalled Windows 7 again and it was a clean installation not a upgrade but again got the same issue. I removed the standard Windows driver and installed the drivers from the Sony’s website for Win Vista NVIDIA GeForce 8400M GT version 7.15.11.6760 but still got the same error "Playback stopped because your graphics card driver is incompatible". Then I ran dxdiag and it verifies the graphic 'chip type' as GEForce 8400M GT. So I went to NVIDIA’s web site to see if there is any latest driver available for NVIDIA GeForce 8400M GT and I found this file (266.58_notebook_winvista_win7_32_international_whql.exe) so I tried installing it but it fails with error: "This graphics driver could not find compatible graphics hardware." So now I have many question to ask, but the two main questions are: why can't I play my Blu-ray DVD on Windows 7, why can't I install the latest NVIDIA driver from this site?
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