Ok since my first post wasn't helpful, and my 2nd post may not be clear. I'll give you the steps to help you overclock (although you should read guides online. They're very helpful)
1. Ensure that your processor is running at acceptable temperatures. If it is not overclocked and it reaches high temperatures that are not acceptable (or close to unacceptable) then do not overclock until you get better cooling, or only overclock on stock voltage.
2. If you have done the first step, the next thing to do to make things easier is manually lock the CPU voltage to the stock voltage.
3. Next, set the FSB:Memory/RAM ratio to 1:1. To achieve this and confirm it properly, go to CPU-Z after you do the setting. If your FSB is at "333 MHz", then your memory should ALSO be at 333 MHz or 666 MHz (depending on how things are supposed to be read. A 1:1 ratio implies that the memory should be 333 MHz, but DDR is double data rate, so you multiply it by two) This step will make it easy to find the CPU overclock without worrying about memory issues.
4. Manually set your RAM voltage to what it is supposed to be rated at.
5. Slowly raise your FSB little by little (5-10 increments) and see if it can boot into Windows completely. When it can no longer do this, it's time to raise the voltage or lower the FSB speed. You can also accompany the "boot up test" with a short stress test to see if it's remotely stable before pushing things further.
6. Do this until the voltage requirements become too high (past the acceptable voltage. For Core 2 Quads on 45nm, I believe it is 1.4, and for 65nm, I believe it is 1.5V) or if the temperatures in stress testing become too high for your cooling.
7. After this, you can choose to optimize your memory by having it run at higher speeds or messing with the timings. I normally just follow the CPU-Z tab that tells you the lowest timings at certain speeds at certain voltages.