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HP 6530b window 7 dim screen after bios update & no audio

HP 6530b notebook
Microsoft Windows 7 (32-bit)
After downgrading my PC from Window 10 to Window 7. My HP 6530b screen became dimmer & has no audio driver installed. I tried Realtek & other audio drivers on HP website. After installing, the reply was that the driver is not compatible with my system..
Please, somebody should help me. Especially the audio issue.
Thanks
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