Can’t access php files copied into /var/www/ or other folders

I'm on Ubuntu 12.10 with LAMP setup. I copied a subdirectory which has project files (php, html, css) from xampp/htdocs on my Windows PC into /var/www/ of my ubuntu. However, when I access those files from browser (I can see the directory listing), I get 403 Forbidden on all files within that directory. So I create new dummy php files within that directory just to see if I can access, and it works. Any idea what might be the problem?

Converting .htaccess to nginx (mod_rewrite)

I've got the following .htaccess file for my apache:

<IfModule mod_rewrite.c>
  Options +FollowSymlinks    
# Options +SymLinksIfOwnerMatch
  RewriteEngine On
  RewriteBase /
  RewriteRule ^$          index.php       [L]
  RewriteCond %{REQUEST_FILENAME}         !-f
  RewriteCond %{REQUEST_FILENAME}         !-d
  RewriteRule (.*)        index.php?page=$1  [QSA,L]
</IfModule>

Suddenly I had to change my webserver to nginx and I don't know why, but the mod rewrite is not working.

I used an online 'converter' to convert it, so I've got the following:

location / {
  rewrite ^/$ /         index.php       break;
  if ($request_filename ~         !-f){
    rewrite ^(.*)$ /       index.php?page=$1   break;
  }
}

Could you help me what's wrong?

Thanks in advance, Marcell