Overclock CPU Intel Core Duo?

Thats impossible.
Where did you read that?

I did a google search for  "Overclock Intel Core Duo"  and i read about it in other forums... Even if they were BSIng.. Does anyone know a program where you can even if its a couple 100 mhz

I think you need an "overclock friendly" bios, that let's you put the voltages higher.

It's pretty risky what you want to do, because of the heat the overclocking will bring to your laptop.

I saw the page you're referring to. The overclocked Duo wasn't clocked at 7GHz.

Someone managed to overclock their Duo T2600 to the point where it performed a very complex calculation in world-record time. The previous world record was an overclocked P4 that ran at 7GHz.

The overclocked Duo, however, was being extremely cooled by a SubZero cooling system, to the point where the processor reached -100 degrees.

http://www.madshrimps.be/forums/printthread.php?threadid=23453

So don't expect to be able to do anything like this with your Dell, unless you're willing to put in some serious time and money modifying it (and probably making it a lot less portable).