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PC Hardware Issues Memtest86 Crashes, how to determine what hardware is failing?

Hello,
I have a Windows 7 PC that has been crashing randomly. It seems o run better for a few days after rebooting. If I leave it up and running for severals days it wil BSOD about every three or four days. If I reboot every day it doesn't crash.

So far I ran windows update, ran all virus and spyware scans, updated all of my drivers, ran SFC /scannow, ran a full check disk with fixing errors, defraged. I have not reinstalled the OS and trying to avoid that.

I created a memtest86 CD and started running the test, twice now and both times it stops with a error Unexpected Interrupt - Halting CPU (Attached Screen Shot).

So now I am thinking it may be a motherboard or CPU or maybe even my GPU. Are there any other tests or ways I can test to make sure what the hardware issue is? Something similar to Memtest86 but for CPU, GPU or mobo?

It would be great to have a good idea of what to replace before buying parts.
Memtest_Error.JPG
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Scott C
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I ran memtest86+ for two days and no crashes or errors this time so I guess its safe to say it is not memory related. I tried finding a diagnostics tool for my mobo, a....

Board: PEGATRON CORPORATION VIOLET 3.02
Serial Number: 101776950004113
Bus Clock: 200 megahertz
BIOS: American Megatrends Inc. 5.22 04/15/2010

Look for diagnostics tools I can run on the mobo and CPU.
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