Windows 7: Sudden BSOD with irql_not_less_or_equal

Hey guys i just got a new pc not less than 12 hours ago, and i was playing dota but then after i quit dota my pc suddenly went blue screen and restarted itself and the IRQL_NOT_LESS_OR_EQUAL came up. Here are some of the details from the report.

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033

Additional information about the problem:
BCCode: a
BCP1: FFFFFA806210BADA
BCP2: 0000000000000002
BCP3: 0000000000000000
BCP4: FFFFF80002CF62F7
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\063012-11793-01.dmp
C:\Users\USER\AppData\Local\Temp\WER-14695-0.sysdata.xml

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I just hope someone can help me fix this, i'm a total noob in computers and stuff. Thanks a lot.

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