BSODs fairly frequent, 0xf4, no dump created

OK, let's see if I can get help here as both hardware guys I know are baffled...

First off, I have no dump files. I have set the machine up to create minidumps, I have a pagefile on the right drive, I have tried both having Windows manage the pagefile and setting it manually to a size well above my memory size, the whole nine. I didn't even have a Minidump directory until yesterday, when I manually created it to try to encourage it to write a dump!

The error is an 0xf4. Awhile back I got a 7A but everything for a couple weeks now has been f4. It occurs at random, completely, but the last few have been preceded by a general nonresponsiveness of the machine even though I retain full mouse control.

The BSOD never makes it past initializing for crash dump; probably why there aren't any .dmp files to be had. While there are no dump files, the event viewer seems to have quite a few "Atapi - Event ID:11 - The driver detected a controller error on \Device\Ide\IdePort0" errors in clusters.

I built the system, all brand new, just under 6 months ago. Hardware is as follows:
MOBO: BIOSTAR|A880GZ
CPU: AMD quadcore FX-4100 3.6gHz
GPU: MSI|N550GTX-Ti
PSU: ANTEC|BP550 PLUS
RAM: 4Gx2|GSKILL F3-12800CL9D-8GBRL
HDD: 500G|WD SATAIII WD5000AAKX
OS: Win7Pro x64

Tests I have run thus far:
Windows Memory Diagnostic - no problems
MalwareBytes full scan (1 infected found and removed - affiliate.downloader)
MSE full scan - no problems
sfc /scannow - no problems
chkdisk - no problems
WD Data Lifeguard - was running when I left the house this morning.

I have not done memtest86+, mainly because my flash drive didn't register as bootable, but then again I've heard it isn't great with AMD procs.

I have manually updated the BIOS to latest, and had to DL and install a new ethernet driver to eliminate a /!\ in Device Manager. The BIOS solved a temporary issue wherein the machine would not fully boot with my USB Wifi Adapter plugged in.

Error conditions:
Seems to be at random. I've not seen it BSOD while playing games or doing heavy Adobe CS work or anything obvious like that. For some reason I thought it was Google Chrome doing it, and when I stopped using that it remained stable for 2 whole days (so I thought I was right) and then crashed again. Yesterday, twice.

Note: though I built the machine, it was with heavy guidance from one of my hardware-savvy friends, so if you ask or tell me something about cabling and ports on the mobo, etc, you'll have to be very, very specific. I am not a HW guy.

Thanks in advance for any assistance here - pulling my hair out.

Addendum 2 - I am attaching the Seven Forums ZIP from SFdiag.

I see in the system info that the pagefile is set to the exact size of my physical memory - but I have it set as custom size, min 8170MB, max 12255MB. That should easily accommodate the minidumps.

Please be patient. We are all volunteers here, and the BSOD team is swamped.

Go to: C:\Windows\Minidump.

Are there files in there? If so, Zip them and attach them to your next post.

-Justin

A complete re-install may need to happen. But to be on the safe side make there there arent any viruses:

Do a full scan of your system using: Microsoft Security Essentials - Free Antivirus for Windows

Afterwards: Malwarebytes : Free anti-malware download

If nothing pops up for both of those,

try: Windows Defender Offline

-justin

Code:

Event[1387]:
  Log Name: System
  Source: Microsoft-Windows-WLAN-AutoConfig
  Date: 2012-02-23T19:25:41.238
  Event ID: 10000
  Task: N/A
  Level: Error
  Opcode: Info
  Keyword: N/A
  User: S-1-5-18
  User Name: NT AUTHORITY\SYSTEM
  Computer: SteamCastle
  Description: 
WLAN Extensibility Module has failed to start.

Module Path: C:\Windows\system32\athExt.dll
Error Code: 126

There are a ton of those. Please make sure you have the latest WLAN drivers available.

-Justin