Windows 7 Home Premium 64-bit on HP Pavilion P6597c BSOD + Hanging

I bought a refurbished Pavilion P6597c about 3 months ago; it was completely wiped and I loaded Windows 7 Home Premium 64-bit, installed a second western digital hard drive (1 TB), a Nvidia GT 610 (1 GB model) and a Asus Xonar DX sound card. I also installed a 600 watt Thermaltake power supply.

I had installed all critical updates, loaded the most current drivers available directly from HP and other manufacturers.

The system ran perfectly until about a week or so ago, when it started randomly hanging (not a BSOD but the system just locked up/froze), and quite a varietly of BSOD's.

I un- and re-installed drivers; tried different versions, tried switching to the onboard video (in case the card was failing), re-assured internal componests were properly seated, switched anti-virus from Avast to Panda (incase it was a program update conflicting), ran CPUID to make sure the power supply was functioning and that components were not over heating; ran Memtest 86 for half a day to check the ram, and ran Western Digitals Data Lifeguard to test the hard drives. tried sfc /scannow to check that windows files were not damaged/missing and ran TDSSKiller to check for hidden rootkits. Everything seemed perfectly fine.

...except the system still crashed randomly. The crashes/BSODs finally were getting so frequent that I could not load windows, it would hang constantly before even getting to the safe mode option (strangely enough safe mode never crashed). Windows finally corrupted from so many partial/inturrupted boots and unexpected shutdowns.

With Windows unloadable; I finally wiped the drive again and started new 4 days ago, and the problem is now re-emerging. Random crashes and BSODs are creeping back in with greater frequency. It took 20 minutes to get windows running just to make this post.

I am at a loss; I am usually good at diagnosing and repairing these sort of problems, but the BSODs give different errors, usually pointing to various hardware which then test perfectly.

Hopefully someone here can point me in the right direction because I am genuinely puzzled by this one. I made no changes to the system setup, but it went from running perfectly to barely functioning.

Thanks all in advance.

Code:

Event[26249]:
  Log Name: System
  Source: Ntfs
  Date: 2015-02-09T19:03:54.309
  Event ID: 55
  Task: N/A
  Level: Error
  Opcode: N/A
  Keyword: Classic
  User: N/A
  User Name: N/A
  Computer: Tavi-PC
  Description: 
The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume Windows 7.

Code:

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*                                                                             *
*                        Bugcheck Analysis                                    *
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Use !analyze -v to get detailed debugging information.

BugCheck 7F, {8, 80050031, 6f8, fffff80002b12437}

Probably caused by : ntkrnlmp.exe ( nt!KiDoubleFaultAbort+b2 )

Followup: MachineOwner
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Code:

*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck A, {fffff33f, 2, 1, fffff80002ac410e}

Probably caused by : hardware ( nt!MiResolveTransitionFault+20e )

Followup: MachineOwner
---------

There are many indications of hard disk failure. Run the LONG tests of the DOS version of SeaTools on both WD disks and report the result:
SeaTools for DOS and Windows - How to Use

Hello Golden, thank you for the reply!

I have just completed running Seatools for DOS on both drives, and the tests (short DST and Long Test) for both drives showed as 'Passed', no errors reported.

I also ran Western Digitals tests both quick and extended on each drive, both showed as passed as well.

I finally ran Windows built in error checking on the windows drive, set to test at boot and it found some file fragments (probably not unusual for a system that randomly locks up/BSOD's) but otherwise also reported no physical problems/bad sectors.

As far as I can tell, and as all testing seems to report, both drives do appear to be operating perfectly fine.

OK. Run these please and report results:

1. Click Start
2. In the search box, type cmd
3. In the list that appears, right-click on cmd.exe and choose Run as administrator
4. In the command window that opens, type chkdsk /R and hit enter.

You will be prompted whether you wish to schedule a chkdsk scan at next startup, type 'Y' and hit enter. Now restart your computer and chkdsk will automatically run.

Next:
1. Click Start
2. In the search box, type cmd
3. In the list that appears, right-click on cmd.exe and choose Run as administrator
4. In the command window that opens, type sfc /scannow and hit enter.

Report the output from the command window once it finishes.