Blue Screen error after Hibernate/Sleep and closing the display

Hi All,
i'm recently getting this blue screen error whenever i hibernate/sleep my laptop (DELL Vostro) and closing the display immediately. sometimes it appears when i shutdown or restart the system.
The most recent error i got after reboot was as follows.
Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.
Locale ID: 1033

Additional information about the problem:
BCCode: 9f
BCP1: 0000000000000003
BCP2: FFFFFA8004690A20
BCP3: FFFFF8000498E4D8
BCP4: FFFFFA8006D41140
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
--------------------------------------------------------------------------- View attachment 062612-16614-01.rar

I have attached the corresponding DMP file also.

Hope any of you can help me out...!!!

Thanks i advance

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