Blue Screen Vista Ultimate RTM

Here's the blue screen error number..
0x000000124 (0x00000000, 0x83fba028, 0xb2000000, 0x00070f0f)
even though I've never heard of anyone being able to tell you what it means.

Here's my machine specs..
A8N32 SLI Deluxe ASUS motherboard, AMD Athlon 64 4400+ X2,
TWINX2048-3500LLPRO CORSAIR XMS RAM, 2 BFG GeForce 7800 GT OC in SLI mode, 2
Sony DWQ30A DVD Dual Burners, Mitsumi 7&1 floppy/card reader, Adaptec 4 USB/3
Firewire card, SILVERSTONE ZEUS SST-65ZF ATX 650W power supply, Silverstone
SST-TJ07 case

It had a MS bluetooth KB/M but I unplugged those/the receiver/transmitter to
see if that stopped crashes.

I've disabled all kinds of power options because it wasn't shutting down,
Screen would go black but machine still running. It will finally shut off
now but still crashes.

I"m using the latest Nvidia drivers, not the one Windows update
installed-crashed with those to.
Using the lates Realtek drivers, not the one windows update
installed-crashed with those to.

Keep getting a blue screen, intermitentally, while doing different things.
There's a unknown device in manager that never will install, I've disabled
that yet all HW working. I've unplugged the game port and serial port from
MB headers, still crashing.

Software installed:
All updates from MS update
Office 2007 Ultimate: Crashed without this
Turbo Tax 2007: Crashed without this
Quicken 20003: Crashed without this

Any ideas?