Windows 7: BSOD nightmare, please help!!!

Hi there!

Over the past 6 months I have been constantly plagued with several different BSODs.
It started with Memory_Management BSODs with some PAGE_FAULT_IN_NONPAGED_AREA in between and some IRQL_NOT_LESS_OR_EQUAL after that.

I have tried a number of advised solutions, including changing the ram modules around I have found, driver updates and Memtest which doesn't seems to produce an outcome.
I dont know what to do from here, please your advice would be much appreciated as the failures have been the source of much frustration!

I have Windows 7 Ultimate x64 which I installed about 4 months ago and the system is about 1 years old, several parts are replaced.

Kindest Regards,

please find the following technical specs for the workstation, via Speccy. Look forward to hearing from you.

rebelwithacause.