New Gaming PC Keeps Rebooting/Freezes During Windows Updates - Need Help Please!

First my system specs:
CPU: Intel Core i5 3570k 3.4ghz quad-core processor
CPU Cooler: Cooler Master Hyper212 plus
Mobo: Asus P8Z77-V ATX LGA1155
RAM: G.Skill Ripjaws X series 8 GB (2 x 4gb)
Storage: Samsung 840 Pro Series 256 GB SSD (contains OS and drivers only)
+ Western Digital Caviar Black 1TB 7200rpm
+ Seagate 500 gb external harddrive (unsure of specifics, writing this at University)
GPU: EVGA Geforce GTX 670 FTW Sig2 2gb
Case Fan: 1 Cooler Master Megaflow 200mm
PSU: Corsair 700W ATX1V 80 plus bronze certified
Optical: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer
OS: Windows 7 Home Premium SP1(OEM) 64 bit

Background info:

I completed my first homebuilt PC a few days ago, at first everything was working swimmingly, set up everything following these recommendations...
... Ran windows updates, installed drivers, etc. without a hitch.
Installed steam and began downloading several games, transferred several of them from my old PC via an external harddrive along with about 80gb of music. Played World of Tanks to see the difference for about 2 hours. No problems at all.

The 'ish':

First situation arose when opening a picture stored on my iphone, the system shut off with no warning as soon as i brought it up. Turned it back on and did a google search, from what I found I figured it was a confliction with a usb driver, since that was the last error before the 'unexpected shudown' in the event viewer and in accodance to what I read online. Unplugged cable and noted to fix later.

Later ran Shogun 2 for about 4 hours until the comp randomly shut off and started trying to reboot itself. The fan and PSU LEDs came on and all fans started spinning for about 5 seconds then shut off again, this repeated several times until I pulled the cord. Let sit for around 15 minutes, pushed power button and system booted up.

Did more research and updated my BIOS as well as replacing the Nvidia beta driver with the 314 version. Began to suspect my Video card
Ran windows updates manually and shut down. At this point the comp froze at 'installing 7 of 19' for about 45 minutes. Another google search via iphone and I shut off the PSU. Began to suspect that instead.

Upon ANOTHER start up I was met with a message along the lines of 'asus anti-surge has detected an unstable power supply something something' and was directed to the BIOS. Phone dead at this point I disabled anti surge protection to boot and run more googles, desktop loaded as per usual.

An hour of research yielded little help, found several threads of people with similar problems but on older systems whose solutions were troubleshot by identifying a confliction within XP or testing against known-working PSUs or GPUs. (Neither of which are possible for me, having none).

I decided to try it one more time...
Replaced the previously connected 'supplemental power cables' that came with the GPU with the PSUs basic 6 pin PCIe 6 pin power cables thinking that they might be somehow drawing too much power,
plugged PSU power cable into wall outlet rather than the power strip it was in before (can't believe I did this, although the only other things in the strip were the external HDD power cable and a lamp, must have confused the monitor and PC power cables as the monitor was plugged into the other wall outlet beside the strip),
set 'Asus optimal' under system performance in BIOS,
turned off auto overclock via 'AI Suite II',
Ran Shogun 2 for several hours with no problem.
Feeling confident again, attempted to run windows updates. Froze on '14 of 19' this time.
Turned off PSU power switch.

I then attempted to boot one last time with the intention of loading the base system image, however it just kept attempting to start then shutting down after ~5 seconds again.
Gave up and flipped PSU power switch.

Over the course of using my PC from start until now i've frequently monitored the 'AI Suite II' system sensor, CPU temps never rose above 35C and mobo temps were typically ~20 and below. The +12, +5, and +3.3 voltages were WELL within the +/- 10%/5%/5% (respectively) ranges.

Had the mobo warning speaker connected over the course of happenings, beeped in the affirmative on all successful boots, not at all during the reboot loops.

I'm fairly certain there's an issue with the PSU but I'm going to try to breadboard the build when I get home as one last check, but other than that I don't know what to do. Considering just taking it in and letting someone else handle it.

But before I do that I want to see if any of you know exactly what to do and can help me out here. Did I dangerously noob this up??
Any kind of assistance will be GREATLY appreciated.

Many thanks in advance!
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  1. These are just really weird issues. I'm at a loss, the only thing that comes to mind, is faulty Mobo, or PSU. Now, RAM is notorious for causing almost infinite types of problems lol. I guess you can try troubleshooting the RAM.
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