Hardware freezes (possibly memory?)

[IndexRated]

My computer has started ‘freezing’ and posting up BSOD, the BSOD always relates to 0x00000a caused by ntoskrnl.exe but freezes are more common than the BSOD, only had two BSOD's.

A day ago the OS told me it had “critical error Windows will restart in one minute” Which it did, and it corrected a corruption of the O/S.

The freezes aren’t random, have to reset the computer by the power button, they can be triggered, processing a video in Corel VideoStudio for example freezes it within seconds, Prime95 causes an instant freeze, but playing Assassins Creed 3 doesn’t and it plays flawlessly.

I ran memtest86+ the first time I got a report of test six failing, but then I ran it again for two hours and wasn’t able to get a fault (I plan on leaving it running over night)

Am I right in thinking this is a memory issue? I haven’t ruled out the power supply but my experiences with power supply failures are instant restarts (like a power cut) rather than a locked up freezes.

Temperature's of the CPU/Graphics card haven't changed, they're all fairly low/normal.

Being able to play Assassins creed 3 flawlessly has confused me.

Any help/info would be appreciated.

Intel Core i5-2400
Nvidia GTX 460 Super Hawk
OCZ Gold 4gb DDR3 1333Mhz
Samsung 1TB drive I think it's a Spin-point F3
PSU: BeQuiet Pure Power L7 530W

System was built by myself, it's about a year and a half old.

 

[zakblood]

the games will be pushing it at max same as memtest does, if you can't get it to do it again, might not be memory, try scanning your hd for errors, check and fix etc

h88p://ss64.com/nt/chkdsk.html

 

[Cold_And_Miserable]

My computer has started ‘freezing’ and posting up BSOD
it corrected a corruption of the O/S.
The freezes aren’t random
Prime95 causes an instant freeze

If Prime95 freezes instantly then your system is crazy unstable and it's a certainty the OS installation is corrupt which means lot's of annoying random glitches so you'll have to format.

It's got to be bad memory stick(s) or memory settings.

 

[IndexRated]

I can definitely say whatever causing it has corrupted the O/s (which is Win7 by the way, forgot to mention that), I had to repair several times to get it to boot, and I was just getting BSOD's on start up the 0x00000a and 0x0000007E (but I did leave Memtest running for the past eleven hours). One BSOD also said"Memory management". Haven't had the chance to check the dmp file yet.

Memtest reports a failure at the same address at 4521.2MB every time, but the test failure changes, anywhere between 10-34 errors get flagged.

(Might be a dumb question but how can it be at 4521.2mb when I've only 4078MB Ram?)

To get it to boot this morning I had to set the voltage off auto and onto 1.65v (could be a coincidence that it just decided to boot after I did that).

Guess I need to open it up and play with the sticks, it's a pita because my graphics card is so close to the memory slots. Wish I had some spare DDR3 I've only DDR2 and older.

 

[IndexRated]

Just an update. After I set the voltage from auto to 1.65v Memtest discovered no errors but I only got chance to run it for two hours and it's done that before but immediately before that it was picking up errors on every run through of it).

I managed to successfully proccess a video, and I'm giving Prime95 a run through now, an hour so far which is so far passing tests and running fine.

I can't believe faulty/dodgy memory would be fixed by setting the voltage, it's ran fine for a year and a half on auto?