BSOD on boot but not restart

Hello,
I startted getting a Bluescreen error on start up and when waking the PC out of hibernation a few weeks ago, when i chose to start from last know good settings it worked fine but it stopped that and i thought i would be clever and reinstall windows which did not work and i am still getting various blue screen errors on start up and yesterday it started craching with blue screen errors of it's own accord. The PC Restarts fine without errors and if i boot in safe mode i can Restart and it boots fine, if i keep rebooting when a blue screen appears it does not load from the options screen with includes the three safe mode options, last know good configuration and start windows normally but if i get the page with options not including the last known configuration options it will boot.

I had not installed any software or hardware in the week prior to the blue screen but there was an automatic windows update and in the initial bluescreens when i could boot from last know configuration it would download another update, i'm sorry i don't know which update this was and it was before i reinstalled windows, i have recently turned off automatic updates and download them myself.

This is the info i get when i get the PC booted finally (this does not show on Restarting):

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6000.2.0.0.768.3
Locale ID: 2057

Additional information about the problem:
BCCode: d1
BCP1: 00000000
BCP2: 00000002
BCP3: 00000000
BCP4: 87BE0C30
OS Version: 6_0_6000
Service Pack: 0_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\Mini092908-01.dmp
C:\Users\Rhian\AppData\Local\Temp\WER-74240-0.sysdata.xml
C:\Users\Rhian\AppData\Local\Temp\WER3D8C.tmp.version.txt

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On the bluescreen itself this is what i have always got including before reinstalling windows:

A problem has been detected and windows has been shut down to prevent damage to your computer.
driver_irql_not_less_or_equal

(Some info that should be here i haven't written down in my notes and i don't really want to start a bluescreen to get them but they were somewhere along the lines of:)

If this is the first time you have seen this error screen reboot and uninstall any new hardware or software.
Disable BIOS memory options such as caching or shadowing.
If the problem persists contact your person who know what they're doing

Techincal info
STOP: 0x000000d1 (0x00000004, 0x00000002, 0x00000000, 0x87bdd8ba)

ecache.sys-address 87bdd8ba base at 87bdb000, datestamp 4549b1da


There are errors that create dumps but i don't know what to do with them.

This is another error i have been getting this week:

STOP c0000221 unknown hard error
\systemrootzsystem32zntdll.dll


And i also get basic bluescreen errors that just say an error occured and windows had to be shut down to avoid damage or something of the like.

I don't know if this is related but i am getting lots of HOST HAS STOPPED working for various things and DATA EXECUTION PREVENTION things when windows is running, this could be a virus but AVG has not detected it.

I've tried researching the blue screen thing online to no avail of anything really applying to me, i don't know how to check if my drivers are working or if any hardware is broken, the PC is only a year old so i'd hope not.

Thankyou for your time!