Your motherboard is not great for overclocking, and also using a stock cooler will affect the overclock.
this is a very basic explanation of overclocking
its basic maths. your E6500 is rated at 1066mhz. you always divide this number by 4 so 1066/4= 266, this is your fsb. (or cpu frequency)
then your processor (cpu) has a multiplier of 11 (or cpu ratio)
so 266 x 11 = 2930mhz or 2.9GHz, your stock speed
download cpu-z and lt will tell you all the info you need. (make a note of ram speed, volatge etc.)
boot into bios,
and disable C1est, and any other power saving features.
unlink your ram, using the ram divider, so it stays at stock speeds, you can overclock the ram later.
this means leave it at 667mhz or 800mhz or 1066 or whatever it should be
can you raise the fsb? yours is now 266. try rising it to 280
boot into windows
download realtemp and coretemp (google them)
install and run them
then download Intel Burn Test (IBT) and run it.
have a look in task manager and under the performance tab, notice how much free ram is listed.
in IBT set threads to 2 (for 2 cores) and then click on custom ram and enter an amount just below the free amount.
eg. i have 2520mb free ram. so i enter 2500 into the custom ram.
run the test for 10 passes. for now,
and then at final speed you want, run for 50 passes
keep an eye on temps (do not let it go over 75.c)
or download prime95 and run the torture test/large fft's
if test runs fine, go back into bios, and change frequency (fsb) to 300 (300 x 11 = 3300MHz or 3.3GHz) and repeat the tests.
keep doing this in 20mhz steps until windows will not boot.
When this happens, just go back a step (remove 20 from the fsb) to the last stable frequency,
or
just raise the cpu voltage a couple of levels. it should now boot.
its a balancing act, higher voltages will get you higher fsb, but it will also give you higher temps.
afaik your max voltage is 1.36v
the trick is to do this step by step,
also read the sticky
http://forums.overclockers.co.uk/showthread.php?t=17612922