.htaccess con xampp bajo windows

[guerrerozj]

perdon mi codigo es este:
<?php

include("conex.php");

$nick=$_POST['nick'];
$password= md5($_POST['password']);

if (isset($Entrar))
{ if (isset($nick) && isset ($password))
{ $link = conectarse();
$query = "SELECT nick, password FROM clientes WHERE nick='$nick' OR password = '$password'";
$result = mysql_query($query,$link);
if (mysql_num_rows($result) != 0)
{ $link = conectarse();
$query = "SELECT nick, password FROM clientes WHERE nick='$nick' AND password = '$password'";
$result = mysql_query($query,$link);
if (mysql_num_rows($result) != 0)
{ header("Location: pcatalogo.php?nick=$nick"); }
else
{ header("Location: sesion.php?band=2");
}
mysql_free_result($result);
mysql_close($link);
}
else
{header("Location: sesion.php?band=3");
}
mysql_free_result($result);
mysql_close($link);
}
}
?>