I guess no one ever actaully bothers to search forumsSearch found 61 matches: +mediawiki
This particular question has been answered many many times
A. Everyone working on the project already knows that there is a PHP bug that keeps stiki-wiki from working (or so the stiki-wiki page says)
B. - XAMPP is a suite, so you can't mix and match pieces
C. (this is somewhat new) There is a beta being tested - but that also means there are still things to fix
D. - vastly huh?
E. - THERE IS A FIX! - Install Apache, Install PHP, Install MySQL (stir well) and make them work.
(actually TWO fixes - If you search the forum, you will find I point out there is an older XAMPP you could install)
sooo - get cracking - OR wait for the new XAMPP or WAMP.