No splash do Xampp vai em config na linha do apache
Escolha Apache httpd-conf
Na linha do listen coloque 0.0.0.0:80 e remova o # no inicio da linha caso exista
Procure a opção <Directory />
acrescente essa linha:  Allow from all

e tem um Directory mais para baixo e deve ficar basicamente assim :

DocumentRoot "C:/xampp10/htdocs"
<Directory "C:/xampp10/htdocs">
    #
    # Possible values for the Options directive are "None", "All",
    # or any combination of:
    #   Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
    #
    # Note that "MultiViews" must be named *explicitly* --- "Options All"
    # doesn't give it to you.
    #
    # The Options directive is both complicated and important.  Please see
    # http://httpd.apache.org/docs/2.4/mod/core.html#options
    # for more information.
    #
    Options Indexes FollowSymLinks Includes ExecCGI

    #
    # AllowOverride controls what directives may be placed in .htaccess files.
    # It can be "All", "None", or any combination of the keywords:
    #   AllowOverride FileInfo AuthConfig Limit
    #
    AllowOverride All

    #
    # Controls who can get stuff from this server.
    #
    Require all granted
    Allow from all
</Directory>

certifique de manter a pasta do DocumentRoot de acordo com o que está na máquina

Pare o Serviço
Inicie o serviço