BSOD error

[sudoku]

i keep getting BSOD when my computer is idling or on sleep mode. please help

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 18441

Additional information about the problem:
BCCode: 7a
BCP1: FFFFF6FC40023F18
BCP2: FFFFFFFFC000000E
BCP3: 0000000071C4FBE0
BCP4: FFFFF880047E3000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\042410-48266-01.dmp
C:\Users\ry\AppData\Local\Temp\WER-11172604-0.sysdata.xml

thanks you for your help

 

[sudoku]

i am using windows 7 ultimate btw, any help is greatly appreciated