hi my laptop has a intel celeron 2.6ghz (2600mhz) 128kb L2 CACHE 400 BUS SPEED

i was thinking on updating the processor although this is an high speed processor i was thinking in getting a pentium 4

is it worth getting a pentium 4 ?
could i intall it in a laptop ?

thanks for any information

bond

That depends very much on you laptop.
First of you need to know if the cpu is in a socket on the board or just soldered to it. If it's in a case you can theoretically change it against one with the same socket. If not you have to live with your celeron.

And another very important matter is your cooling. A pentium4 will produce a lot more heat and I doubt your cooling is able to handle that. If it's too hot the pentium4 may run slower than the celeron or not at all!