BSOD at seemingly random times when system is not under load, new comp

[Munchy2x2]

Built my first rig as a treat after exams (4 months ago) and have relatively few issues with it, but every so often (once or twice a week) I'll get a BSOD. No single program seems to be triggering it, and it never occurs in games or when the system is under stress. Most often it occurs a few moments after I exit a game or sometimes when I alt tab on chrome. Most of the time this occurs after my computer has been on for some time, but the one I got today occurred after 2 hours of use. I've tried debugging the dumps myself but it's my first time and I don't have the experience to find a solution. Driver verifer did not seem to do anything and as an attempted solution I have turned up my ram voltage from 1.5 to 1.6 as one thread recommended that as a solution. Minidumps attached, I would be greatful if one of the more savy people out there could have a poke because whilst my BSODs are mildy annoying, I'm about to start a lot of coursework and I'd hate to lose time re-writing essays.

 

[Arc]

Install Service pack 1 and all other windows updates. Otherwise the system will remain vulnerable to threats including BSOD stop 0x3B.

[COLOR=Red]Windows 7 Kernel Version 7600 MP [/COLOR](4 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 7600.16385.amd64fre.win7_rtm.090713-1255

• Learn how to install Windows 7 Service Pack 1 (SP1)
• Service Pack and Update Center - Microsoft Windows

Report us for any BSOD after installing Service Pack 1.
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[COLOR=Red]BugCheck 3B[/COLOR], {c0000005, fffff96000104283, fffff8800b07f020, 0}

 

[Munchy2x2]

Cheers

Totally missed it, I knew it was an old copy of windows but I was sure I'd updated everything when I'd set it up, turns out my windows update is corrupted. I kinda can't afford the 8gb download atm, so I'll chuck it on in a weeks time. Thanks, hopefully this will solve all my problems.