Blue screen error in Windows 7

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 1033

Additional information about the problem:
BCCode: a
BCP1: FFFFF800009EA388
BCP2: 0000000000000002
BCP3: 0000000000000001
BCP4: FFFFF800028DD2A0
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\071214-15256-01.dmp
C:\Users\Radhey\AppData\Local\Temp\WER-21418-0.sysdata.xml

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Hi There,

Your Intel graphics driver is getting the blame for these,

Code:

Unable to load image \SystemRoot\system32\DRIVERS\igdkmd64.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for igdkmd64.sys
*** ERROR: Module load completed but symbols could not be loaded for igdkmd64.sys
 igdkmd64+0x5503b

This is a Pre Windows 7 driver,

Code:

 Loaded symbol image file: igdkmd64.sys
    Image path: \SystemRoot\system32\DRIVERS\igdkmd64.sys
    Image name: igdkmd64.sys
    Timestamp:        Wed May 06 11:22:19 2009 (4A01D55B)
    CheckSum:         005D8353
    ImageSize:        005D3500
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4

Rather than deal with that at the moment, you should install SP1 and all the updates you are missing,

Code:

Host Name:                 RADHEY-PC
OS Name:                   Microsoft Windows 7 Professional 
OS Version:                6.1.7600 N/A Build 7600
OS Manufacturer:           Microsoft Corporation
OS Configuration:          Standalone Workstation
OS Build Type:             Multiprocessor Free

I'm sure an updated graphics driver will be included in the updates.

Still I am incurred the same blue screen error that belongs to 0x0000007F I recently installed wd cavaliar new harddisk but I don,t know why this error keeps on coming Is this the RAM issue bcoz currently I have installed 1 gb ddr2 ram , may I need more memory in order to run windows 7