Vista frequently shuts down

I have an Acer Aspire 7530 with Vista OS. The system frequently shuts down on its own (WHEN LEFT UNATTENDED). I will appreciate any help in resolving the problem.

Here the log of the shut down:
Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: 1000007f
BCP1: 00000008
BCP2: 80154000
BCP3: 00000000
BCP4: 00000000
OS Version: 6_0_6001
Service Pack: 1_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\Mini032709-01.dmp
C:\Users\Alex\AppData\Local\Temp\WER-38953-0.sysdata.xml
C:\Users\Alex\AppData\Local\Temp\WERD0E5.tmp.version.txt

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Hi Alec,

You can try out this link

http://forums.techarena.in/windows-v...nce/704917.htm

You might want to try "Clean Boot" troubleshooting if the problem is persistent enough >> http://support.microsoft.com/kb/929135