PT880 NEO-FSR Blue screen / Random reboot during games

Question

System Specs:
P4 3.2GHZ EE
eVga 6800 GT
Enermax EG565P-VE FMA V2.0 (24P) 535W PSU
512MB PQI Ram (Fry's) (single channel, single stick of memory)
SBLive! Value Sound
Western Digital 74GB 10k RPM Raptor SATA
BIOS revision 1.9
Drivers installed:
nVidia 71.89
VIA 4-in-1 4.56
XP Pro SP2 (all patches applied)
Problem Description:
About month ago started blue screening with "Bad_Pool_Caller" when playing Everquest2   
Troubleshooting steps taken:
1) Tested Memory (memtest86 latest version as of this posting)
   a) 1 stick tested with around 13 errors in Random test #7
   b) 1 stick tested just fine / no errors
RESULT: Removed bad stick of memory 
2) Original PSU was 350W POS
   a) Upgraded to Enermax described above
RESULT: Gaming is slightly more stable  
3) Verified airflow and temp was ok
   a) I have 4 Case fans moving air front to back
   b) Cleaned all dust covering case fan openings for maximum airflow
   c) I have a stock CPU heat sync and fan from Intel
   d) I have run 1 week without any case cover to avoid overheating
RESULT: No change, Games still unstable 
Current Problem: My computer randomly shuts down when playing very processor / memory / disk intense games. 
Current Solution: <this is where MSI forum readers come in>
Any help is GREEEEEEEEEEATLY appreciated.

Answer 1

Jeez, i know just what you mean.
I play...er, try to play World of Warcraft. Every 30 minutes or so, i'd get a game crash and a WoW Error Message. The message read, "memory error" which I later learned from their forums was referred to as "memory dump". I figured Blizzard rushed the game out and left some flaws behind in the process. Then the crashes became more and more frequent until the game finally became pretty much unplayable. i then decided to download Microsoft's Memory tester.
About half of all my passes resulted in an error on the LRAND test. Which is bad. I thought, "crap, i must've gotten bad memory" I tested them both individually and found that i could minimize the errors by putting one memory stick in one slot and the other in another slot. It was passable with crashes every 20 minutes or so. However, recently its been getting worse and is near unplayable.
My Friend brought his PC (a bargain basement eMachine) to my house yesterday and I decided to mem test my Corsair memory on his PC. Sure enough 10 passes, with 0 errors. So I ran the larger memory, the 1024s...again 0 errors. I ran his memory for fun 0 errors. Switched PCs. Ran the mem test on HIS memory in MY pc, 5 errors. My Corsairs in my pc, 3 errors. My 1024 in my pc, 7 errors.
I treat my PC properly, I keep the temeratures in check, keep current drivers, buy the best equipment i can afford on my budget, and when i work on it...I always make sure there is no charge in the power supply left over and I make sure and use my anti-static wristband. The problem, it would seem, is the PT880 just isn't memory friendly.