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Installed mediawiki 1.14 onto XP windows computer running IIS version 6, php version 5.1.2 (isapi), and mysql 5.0.51a-community-nt.

Every upload failed with a message "Unable to create public/x/xy". 

The problem appears to be the php recursive mkdir function on windows, which only works with windows type path delimiters (backslash). 

I was able to fix this by inserting an extra line of code in the includes/GlobalFunctions.php as below

function wfMkdirParents( $dir, $mode = null ) {
	global $wgDirectoryMode;

	if( strval( $dir ) === '' || file_exists( $dir ) )
		return true;

	if ( is_null( $mode ) )
		$mode = $wgDirectoryMode;

# Fix for windows
$dir = str_replace("/",DIRECTORY_SEPARATOR,$dir);

	return mkdir( $dir, $mode, true );  // PHP5 <3
}