Xampp and file paths

Question

I'm having hard time with xampp, it realy getting me crazy. I have few installations of Wordpress with Roots Template, which was loading without any css, js..etc. And the solution was to delete Boilerplates default .htaccess and add:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteRule ^assets/css/(.*) /wp-content/themes/test_template/assets/css/$1 [QSA,L]
RewriteRule ^assets/js/(.*) /wp-content/themes/test_template/assets/js/$1 [QSA,L]
RewriteRule ^assets/img/(.*) /wp-content/themes/test_template/assets/img/$1 [QSA,L]
RewriteRule ^plugins/(.*) /wp-content/plugins/$1 [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

Now i'm facing the same problem but with HTML5 Boilerplate and Twitter-bootstrap, standard html5 file with no complex code. I've tried using:

 dirname(__FILE__);

And it still can't locate the files. Anybody had the same problem and found the solution? Thanks in advance.