To get help on installation of IPB, whether local or otherwise, login to your client area and submit a ticket.
Otherwise, since this is moreso related to XAMPP (of which I have not yet tried out) you can try the following site section (or their forums or something similar) and ask your question:
http://www.apachefriends.org/en/faq-xampp-windows.html#xpsp2You didn't specify which operating system you're using either, and since there are 4 iterations of XAMPP, how are we to know where the default installations go?
As a small piece of info:
...you place IPB somewhere in your root folder (i.e.: /root_folder/forums/) and probably go to install.php or setup.php file to begin the installation process.