Blue Screen when only gaming. Pls assist me with solutions

Hi. I'm current experiencing Blue screen and hangs with my pc. I did not install any new programs nor changes the bios settings. My hardware have been fine and i'm not sure whether it's the hardware or software that causes the problem.

- Windows Vista Ultimate x64 bit - Originally installed was also Windows Vista Ultimate 64x - OEM - What is the age of system (hardware)? Around 4 years. - What is the age of OS installation ? Same 4 years too.

This is the problem error log stated:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6001.2.1.0.256.1
Locale ID: 18441

Additional information about the problem:
BCCode: 1e
BCP1: FFFFFFFFC0000005
BCP2: FFFFFA60011AE069
BCP3: 0000000000000000
BCP4: FFFFFFFFFFFFFFFF
OS Version: 6_0_6001
Service Pack: 1_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\Mini050811-02.dmp
C:\Users\MrMana\AppData\Local\Temp\WER-59467-0.sysdata.xml
C:\Users\MrMana\AppData\Local\Temp\WER6F07.tmp.version.txt

=====================================================


I've followed the instructions on using the program -Windows_NT6_BSOD_v3.03_jcgriff2_

I've also attached the files to this post.
Please let me know if you need any more details.
And let me know what's wrong with my system
Lots of thanks..

STOP 0x0000001E: KMODE_EXCEPTION_NOT_HANDLED Usual causes: Device driver, hardware, System service, compatibility, Remote control programs, memory, BIOS

The most likely causes of your BSODs
There are two primary suspects. One is the driver SPTD which has been know to cause BSODs and the other is memory problems. To try to resolve this quickly
please: Fully remove Alchohol 120% or Daemon or other vitualization software that you are using. After that is complted make sure that you remove SPTD with the uninstall tool
Second download and run a memory test. Test for 8 passes. Be sure to test the slots with a know good stick.
http://www.geekstogo.com/forum/topic/246994-guide-to-using-memtest86/
http://www.duplexsecure.com/en/downloads
Use this SPTD uninstaller.