Which P4 cpu is it ?
Which live cd is it ?
Have you got the cd yet ?
i686 is for 32 bit processors
x86_64 is for 64 bit processors
Have you got windows installed at the moment ?
If you have then download cpuz from http://www.cpuid.com/cpuz.php
and install it.
Follow instructions from http://www.lytebyte.com/2009/08/04/h...it-in-windows/
Please don't post in bold writing, it doesn't make people answer faster.