Modifying nav-menu from localhost

No! I cannot see it with /guide URL!!! here the problem. I cant get any link working if the link needs to be shown in localhost.

mod_write is enabled in my .htacces.
I followed some of the steps there, but still not working. They say if I can’t still get it working, write here…
I inserted this to .httpd.conf:

<Directory />
    Options FollowSymLinks
    AllowOverride All
 </Directory>

instead of the one I had with none allowoverride.
I also added:

<Directory /var/www/html>
    # ... other directives...
    AllowOverride All
 </Directory>

In wp-includes/vars.php file, I did this:

//$is_apache = (strpos($_SERVER['SERVER_SOFTWARE'], 'Apache') !== false || strpos($_SERVER['SERVER_SOFTWARE'], 'LiteSpeed') !== false);
$is_apache = 1;

(Actually, I have a different code than the one it says Im supposed to have…)
Finally, I added this to the .htaccess file:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

The only change is that now, when i click on guide link, I get localhost/xampp page, my xampp panel.

Any idea?

Yep, apache was restarted. And about the links u offer, they are just explaining how to install xampp, which I already followed…
What I dont know is if maybe it would be worth to install Xampp again, and try to insert a new WordPress version in it, setting everything again, and then inserting my wp-content folder, to see if this solve the problem… Maybe this could fix it?

Finally I was able to solve my problem. Permalinks were the problem, and I had to edit the file httpd.conf from xampp/appache in order to fix it. The line which was causing problems was #221, where I had to write:
<Directory />
AllowOverride All
Require all denied
</Directory>

Then, I restarted xampp and everything was solved. Anyway, thank you all for your help.