Random BSOD error.

[Quesadilla]

Happens when I play Dota 2, says DRIVER_IRQL_LESS_THAN_OR_NOT_EQUAL

_____________________
Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033

Additional information about the problem:
BCCode: d1
BCP1: 0000000000000000
BCP2: 0000000000000002
BCP3: 0000000000000000
BCP4: FFFFF88000EBC4B6
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\012013-16520-01.dmp
C:\Users\bleezy\AppData\Local\Temp\WER-36441-0.sysdata.xml

Read our privacy statement online:
[url]http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409[/url]

If the online privacy statement is not available, please read our privacy statement offline:
C:\Windows\system32\en-US\erofflps.txt

____________________________________________

My specs :
AMD Phenom II X4 965 BE 4.1 GHz
16 GB Patriot Sector 5 1333 MHz RAM
600 GB Seagate HDD
nVidia GeForce GTX 550 Ti

Thanks!