BSODs in Vista x64 but not in Vista 32bit

Hi guys, I've been using x86 vista on my custom built rig for almost a year with absolutely NO problems. Because I have 4GB of RAM, I had the need to move to x64. I currently have Vista Home Premium 32bit OEM disk and I used my friend's Vista64 Home Premium SP1 OEM disk. I moved to vista x64 almost 3 weeks ago and I've been having major BSOD issues- I get one of the following BSODs atleast once a day!!! Obviously, I HAVE installed all the latest drivers and older ones and nothing is solving my problem.

SYSTEM_SERVICE_EXCEPTION (MOST common)
PFN_LIST_CORRUPT (common)
PAGE_FAULT_IN_NONPAGED_AREA
BAD_POOL_HEADER
MEMORY_MANAGEMENT
Driver_IRQ_NOT_LESS_OR_EQUAL (only got once)

I suspected that it's faulty RAM so I ran memtest86 and I got 9 passes and 0 errors, so it can't be a RAM problem. I reinstalled XP (SP2) and Vista x86, and does NOT give me any BSOD. I'm so confused here, x86 vista and XP works perfectly, but vista64 does not. I never had a single BSOD (except for doing stupid stuff and OCing) in x86 vista for almost a year.
Also one issue I noticed about Vista64 (with SP1) is that a fresh install (nothing installed; not even drivers) of Vista64 gives me the same BSODs listed above if I use it for couple minutes. I don't know if this is normal; can someone confirm this?
Someone please help; I have NO idea why my system hates Vista64 so much.
 

My Computer

For one blue screens are common when going to install the 64bit editions with 4gb installed. You need to remove 2gb to see it up and running first then later add the other 2gb back in. That's a known installation problem.

You could have easily stayed with the 32bit edition but see the some 3.5+gb instead of the little over 4gb. No problems running the 32bit beta of 7 here along with Vista and XP as well with 4gb installed. You won't even need 2gb practically with Windows 7!
 

My Computer

System One

  • Manufacturer/Model
    Custom built desktops =2 Toshiba replace HP laptop
    CPU
    AMD Phenom II X4 975 Deneb core 3.6ghz
    Motherboard
    Gigabyte GA-790XTA-UD4
    Memory
    Kingston Hyper X 1.5v DDR3 PC12800 1600mhz 16gb
    Graphics Card(s)
    MSI Radeon HD 5750 1tb
    Sound Card
    Creative X-Fi XtremeAudio PCIe
    Monitor(s) Displays
    Asus 19" HP 20" second lcd main HP 20" remote pc.
    Screen Resolution
    1440x900, 1600x900 main - 1600x900 2nd desktop
    Hard Drives
    WD Black Edition 1tb Sata II -2
    WD SAS "Heavy Duty" RE class 2tb - 2
    External usb/eSata WD Black 1tb main -1
    External usb only WD Green Power 1tb -1
    PSU
    Corsair 750w 750TX main - Corsair 600w remote
    Case
    Antec 900-2 - SSD compatible eSata ports 2 - NZXT Vulcan 2nd
    Cooling
    Zalman CNPS9900A cpu, twin front 120s, top 200cm, rear 120
    Keyboard
    AZIO Ilumminated keys gaming keyboard/volume control usb
    Mouse
    MSI Interceptor D200
    Internet Speed
    30mbps upgrade
For one blue screens are common when going to install the 64bit editions with 4gb installed. You need to remove 2gb to see it up and running first then later add the other 2gb back in. That's a known installation problem.

You could have easily stayed with the 32bit edition but see the some 3.5+gb instead of the little over 4gb. No problems running the 32bit beta of 7 here along with Vista and XP as well with 4gb installed. You won't even need 2gb practically with Windows 7!
I thought SP1 fixed that issue. My friends have vista64 SP1 disk with 4GB of RAM and they don't get a single issue.

It's NOT the installation problem (installation actually works perfectly without BSODs with 4GB), I get random once-a-day BSODs while using Vista64.
 

My Computer

For the most part the initial problems with SP1 for Vista as well as SP3 for XP seen were corrected there. The installation of a 64bit edition running into problems while 4gb is install is remedied by simply removing all but 2gb.

The continual problems on the other hand are not having suitable 64bit drivers available while Vista has seen a bit more support then XP Pro 64 ever did. The specifics seen on any blue screen usually will point out the problem device driver or possible hardware issue with the code itself. That information would be needed here as well.
 

My Computer

System One

  • Manufacturer/Model
    Custom built desktops =2 Toshiba replace HP laptop
    CPU
    AMD Phenom II X4 975 Deneb core 3.6ghz
    Motherboard
    Gigabyte GA-790XTA-UD4
    Memory
    Kingston Hyper X 1.5v DDR3 PC12800 1600mhz 16gb
    Graphics Card(s)
    MSI Radeon HD 5750 1tb
    Sound Card
    Creative X-Fi XtremeAudio PCIe
    Monitor(s) Displays
    Asus 19" HP 20" second lcd main HP 20" remote pc.
    Screen Resolution
    1440x900, 1600x900 main - 1600x900 2nd desktop
    Hard Drives
    WD Black Edition 1tb Sata II -2
    WD SAS "Heavy Duty" RE class 2tb - 2
    External usb/eSata WD Black 1tb main -1
    External usb only WD Green Power 1tb -1
    PSU
    Corsair 750w 750TX main - Corsair 600w remote
    Case
    Antec 900-2 - SSD compatible eSata ports 2 - NZXT Vulcan 2nd
    Cooling
    Zalman CNPS9900A cpu, twin front 120s, top 200cm, rear 120
    Keyboard
    AZIO Ilumminated keys gaming keyboard/volume control usb
    Mouse
    MSI Interceptor D200
    Internet Speed
    30mbps upgrade
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