Intel Dual core machines

[Julian]

Hello,

So far, I have been using PETSc on a single processor windows machine. Now,
I am planning on using it on a Intel Dual core machine. Before I start
running the installation scripts, I wanted to confirm if I can use both the
processors on this new machine just like how you would use multiple
processors on a supercomputer.
If yes, is there anything special that I need to do when installing PETSc? 
I'm guessing I would have to install some MPI software... Which one do you
recommend for windows machines (I saw more than one windows MPI software on
the PETSc website) ?

Thanks,
Julian.