Blue screen Minidump

I have random blue screens ( maybe 3 or 2 blue screen in 1 Month).
My pc is :
Windows 7 Ultimate x64
CPUEdit Value
phenom 2 965
MotherboardEdit Value
GA-MA770-UD3
MemoryEdit Value
kingston 4x1 gb 533
Graphics Card(s)Edit Value
6850 power color
More info : Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 9242

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

Files that help describe the problem:
C:\Windows\Minidump\121013-14352-01.dmp
C:\Users\markoni\AppData\Local\Temp\WER-28891-0.sysdata.xml

Read our privacy statement online:
Windows 7 Privacy Statement - Microsoft Windows

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


Ty in advance.