First thing i would say is your voltages look too high - in perticular your FSB voltage.
More FSB volts often causes more instability due to it being more suseptable to noise. Even running a q9550 @4Ghz i woudln't think you'd need any more than 1.3V fsb.
I would suggest putting everything back to stock to begin with (voltages+clocks to auto etc) and start again.
Next set the memory voltages and timings correctly if this hasn't occured on auto. 2.0V if that is the spec, unlink and set the fsb such that it runs at 667 or 800MHz for the memory.
Boot to windows and find out your chip's VID. "Coretemp" will show you this.
Next return to the bios and set the core voltage to this (leaving everything else as-is). then increase the fsb speed still with the unsynced memory fsb) in smallish steps, stressing with intel burn test or prime95 tests at each step.
Your stock VID will often take you higher than you'd expect. My q9450 does 3.2GHz on stock volts.
After this just repeat the increase in FSB until it becomes unstable under load, then up the voltage by a small amount. Basic skt775 overclocking. Continue untill you reach your target, run out of volts (most would say keep core under 1.4V for everyday use), or hit the thermal limit (again most would say below 70*C)
EDIT: as mentioned above you may encounter some 'FSB holes' which in most cases will result in no boot, and you'll have to reset the CMOS and try a different FSB.
even changing the FSB 1MHz can be the difference between complete stability and instability.
