BSOD and Memory (perhaps)

Question

Over the last six weeks I have run into a number of BSOD issues which have left me both perplexed and yet and at the same time livid.
The messages onscreen are inconsistent although the crash invariable occurs when playing a game, every game in fact except Medieval Total war (for some reason).
I have attempted to analyse the memory - memtest ran overnight and found no errors. The finger of blame then shifted to point to Norton which has now been blown away, PSU has been checked, thermal paste reapplied etc etc
I was having issues with Nvidia 57.62 drivers but rolled back to 53.03 and that situation seemed to resolve itself in as much as no specific dll was mentioned on the BSOD. Every message seems to point to memory (when followed up on Google) but I would like to resolve any problem if I can rather than replace the memory sticks.
Memory timings were set by SPD at 7-3-3-2 and Crucial are a company related to Microm if that helps  
IRQ settings are as follows - if that helps
IRQ 0   System timer   OK
IRQ 1   Standard 101/102-Key or Microsoft Natural PS/2 Keyboard   OK
IRQ 3   Communications Port (COM2)   OK
IRQ 4   Communications Port (COM1)   OK
IRQ 6   Standard floppy disk controller   OK
IRQ 8   System CMOS/real time clock   OK
IRQ 9   Microsoft ACPI-Compliant System   OK
IRQ 11   NVIDIA nForce PCI System Management   OK
IRQ 13   Numeric data processor   OK
IRQ 14   Primary IDE Channel   OK
IRQ 15   Secondary IDE Channel   OK
IRQ 19   NVIDIA GeForce FX 5700 Ultra   OK
IRQ 20   Standard OpenHCD USB Host Controller   OK
IRQ 20   NVIDIA(R) nForce(TM) Audio Codec Interface   OK
IRQ 21   Standard Enhanced PCI to USB Host Controller   OK
IRQ 21   OHCI Compliant IEEE 1394 Host Controller   OK
IRQ 22   Standard OpenHCD USB Host Controller   OK
IRQ 22   NVIDIA(R) nForce(TM) MCP Audio Processing Unit (Dolby(R) Digital)   OK
Sorry to be vague with the BSOD message info but if I see one more tonight Mr Fist will meet Mr Screen at extreme velocity
Thanks in Advance

Answer 1

IRQ's are fine
So drivers and Norton are the only thing you've introduced to this system prior to this problem?
How long has this OS been up and running?
Have you installed a lot of programs and/or uninstalled them?
At first, I would consider several things.
I need to look back and try to remember when it started happening and then try to tie in what how and when (changes) I've made to the OS, such as new programs, drivers, introuduced new hardware etc. After some investigation, if I can't attribute this problem to possibly any changes I may have made, then I have to consider a hardware or power problem. I don't have either of the latter as I have a good supply like you and I use a UPS with a line conditioner.
You've tested the RAM but that doesn't rule out a problem completely but good enough to look elsewhere for the time being. If it worked great before, no sense in changing memory settings, logic tells me that's like swatting the dog for crapping on your new carpet, when it was really your one year old's diaper that's leaking.
By now I may have come to the conclusion it's probably me that's introduced or had a hand in cocking up my system and I consider a full reformat and re-install to verify my suspicion. It's certainly takes me less time to load the OS then to nitpick around, especially with how I beat up my OS on a regular basis. I can't even go 9 months before I decide it's time.
Just some things to think about, no point in getting angry at a computer, you own it so you have a right to abuse it