Prime95 Stable, but Super Pi Fails 32M test in Vista [Solution Inside]

I have an overclocked Q6600 (3.0ghz, 9x333) on Asus P5k deluxe (0603)

It ran stable on Prime95 v25.5 (4 threads 100% load, small fft for more than 12hours)

But fails just one instance (approx 25 % load) of Super Pi v1.5 32M test

It completed 16K, 32K, 64K, 128K, 256K, 512K, 1M, 2M, 4M

16K: completed in 00.179s

4M: completed in 1m 37.124s

8M: failed after 3m 19.413s Loop 21

16M: failed 5m 41.531s Loop17

32M: failed in 6m 18.938s Loop9

All of them one instance runs, and also times vary slightly for different runs..

Memory: 4 x 1 gb Crucial Ballistix Tracer 800mhz (4-4-4-12) FSB>DRAM, 5:6 (333:400)

Os: Vista Ulimate 32bit (3.3gb Ram)

PSU : Rosewell 750W

Load: 56c, Idle: 38c (Zalman 9700NT)

Vcore: Bios: 1.3125v

Vcore Idle: 1.2480v

Vcore Load: 1.2320v

Is my system stable since it passes Prime95 (4Threads 100%) ?
Why is it failing just one instance of Super Pi v1.5 @ 25%load ???

Finally found the solution !!!
I ran Super Pi 32M under stock settings, however it
failed. This lead me to think that it
was rather a OS/Program issue than a stable overclock issue. So I started searching for Vista Super Pi
issues.

And the windows vista services that affect Super Pi are,1) Windows Audio Service2) Themes3) Aeroglass Interface

By turning these off, I was able to run and complete Super
Pi v1.5 32M test.

1) To turn off Windows Audio Service ( start>
run> services.msc, find Windows Audio on the list , double click and stop it)
Turning off "Windows Audio Endpoint Builder" is
not necessary unless you encounter problem.

2) To turn off Themes ( start> run>
services.msc, find Themes on the list , double click and stop it ) this will
also make you turn off tune up theme extension.

3) Aeroglass automatically turns off by turning off
themes. (you can check it by right clicking on desktop>Personalize>Window
Color and Appearance>Color Scheme )

Another way to disable Audio service:
To disable sound just for SuperPI and then quickly turn it
on. Create two .bat files on the desktop

SoundOff.bat:
net stop "AudioSrv"

and

SoundOn.bat:
net start "AudioSrv"

I found that it is not necessary to run the program as an
administrator or Windows XP SP2 Compatibility mode. But I tried both ways, it
works.

I also found a Super PI front-end called Hyper PI

The author claims it is pure Super PI 1.5 MOD XS and it is
customized for multi-core CPU's: " Run multiple instances of SPI (one
for each processor) and configure the priority of the process easily (without
Task Manager).Take a snapshot of all instances at anytime with only one click!"

I personally wasn't able to download it becasue of some server problem.
http://home.pages.at/virgilioborges/

Note:

"If you can't get the hyper Pi program, and want to run multiple instances of Super Pi for
your Dual or Quad Core, then run the exe from different folders. For
example, if you want four instances of Super Pi to load Quad Core, then
make four separate folders, copy the exe into each, and run from each
folder. Because if you run the same SuperPI exe to load twice (from the
same icon) the initial data is overwritten by the "second running
instance." Therefore, what was correct for the first core, or HT in
your case, is now being overwritten with the second core's info and it
throws out an error "Not convergent in SQR05". There's a little .dat
file that's keeping all of the data"

So I now declare that my Overclock is stable !!!