That error is from your graphics drivers,

Use !analyze -v to get detailed debugging information.

BugCheck A0000001, {5, 0, 0, 0}

Probably caused by : atikmdag.sys ( atikmdag+279de )

Followup: MachineOwner
Loaded symbol image file: atikmdag.sys
    Image path: \SystemRoot\system32\DRIVERS\atikmdag.sys
    Image name: atikmdag.sys
    Timestamp:        Fri Apr 18 19:28:20 2014 (5351DF44)
    CheckSum:         00CA92B0
    ImageSize:        00CFE000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4
Try updating it here,

Laptops :: Lenovo G Series laptops :: G50-45 Laptop (Lenovo) - Lenovo Support (US)

You want the top one,

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