Vista - Vista blue screens

I posted this question earlier but never got much of an answer....

I'm using vista home premium 64bit version for a few months now, and about a
month ago I started having problems. About a month ago I updated my BIOS and
downloaded several windows updates and updated my video driver and since that
day I keep getting Blue Screens on occasion. They only seem to happen when
I'm doing instensive activities such as installing drivers or new software or
when I have multiple applications open and am switching between them. It has
kind of rotated between
3 different BlueScreens:

kernel_data_inpage_error
0x7A
with the second argument being c000000E

driver_irql_not_less_or_equal
0xD1
with the second argument being 0...0z

c000021a Hard Fault/Fatal System Error
0xc0...01

Now I have tried many things to determine the culprit of these problems...
I tried restoring my system
I tried reinstalling vista
I tried using memtest-no errors found
I tried using chdsk-no errors found
I have a virus scanner and it hasn't found any viruses
I have done a fairly comprehensive search of the internet looking at
suggestions for fixes for these problems

My system specs are:
OS: Vista Home Premium 64bit
CPU: Q6600 Intel
RAM: 4GB Crucial Ballistix PC6400
Hard Drive: 500GB SATA Seagate
Video Card: Nvidia 8800 GTS 320MB
Power Supply: OCZ 700Watt GameXstream
Motherboard: XFX 680i

Did you get your vidoe Driver from nvidia's website or Microsoft updates?
Use Nvidia's site.
Did you keep a copy of your BIOS, so you could roll it back to see if that
is the prob?

"mackjam" wrote:

I get the drivers from nvidia's website and I have tried rolling back my BIOS
but that didn't help.

"Mick Murphy" wrote: