Unexpected shutdown - Bluescreen

I hope somebody can help me!!!!
I have a Hp a6040a with Vista Ultimate installed and am finding that I am
getting an unexpected shutdown occuring 2-3 times per day. I continously
click the check for solutions button but it doesn't seem to be helping at
all......Can somebodyy assist me please:

The details I receive are as follows:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6000.2.0.0.256.1
Locale ID: 3081

Additional information about the problem:
BCCode: 50
BCP1: F8686B10
BCP2: 00000001
BCP3: 820E7610
BCP4: 00000002
OS Version: 6_0_6000
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\Mini102007-06.dmp
C:\Users\PC01\AppData\Local\Temp\WER-41699-0.sysdata.xml
C:\Users\PC01\AppData\Local\Temp\WERAD8D.tmp.versi on.txt

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