Windows 7 won't start after installing graphic driver

hi guys
i have a probook 4530s (i5) laptop and recently i encountered a problem with graphics.
after installing a fresh copy of windows 7 x64, i installed lates driver for graphics (sp55947) but after a reset, windows won't pass the first "starting windows" page unless i go to bios setting and uncheck "switchable graphics" option,
but after that i dont have the radeon 6490m in my device manager anymore. i also tried the latest update for bios but no success with the problem..
i hope you can help me..

@M3is4M
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I Work for HP

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                                 8FA5E92E-AD22-4963-A728-00057E6BEB99
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CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group BACE3EFD-026C-4E8C-A749-2F22BE55CD85
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    Name:         Macintosh HD
    Status:       Online
    Size:         350971142144 B (351.0 GB)
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        Conversion Status:       NoConversion
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Password:
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1465149167           1         Sec GPT header
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Signature: 0xAA55
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1: EE    0   0   2 -   25 127 14 [         1 -     409639] <Unknown ID>
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4: 00    0   0   0 -    0   0   0 [         0 -          0] unused
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