Blue screen during playing or after turn on pc

here is my bug


Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 2070

Additional information about the problem:
BCCode: a
BCP1: FFFFF68000005280
BCP2: 0000000000000000
BCP3: 0000000000000000
BCP4: FFFFF80002C5C2A7
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\110410-40794-01.dmp
C:\Users\bambi\AppData\Local\Temp\WER-86720-0.sysdata.xml

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it keeps happening several times and i dont know what to do.