500 internal error

[diogo.webprog54]

In most attempts to install modules / components, always gives me 500 internal error. I wonder what can I do to resolve this situation.
Thanks

[Skizzerz]

Common causes for 500s include:
1) Permissions. Files and directories must NOT be world-writable (aka NOT 777 or 666). The recommended permissions are 755 for directories and 644 for files
2) .htaccess. Check all of your .htaccess files and remove anything a la php_flag/php_value, etc. as these don't work on Free Hosting. Also check if you are using mod_rewrite (RewriteRule) and add a RewriteBase directive for that

[diogo.webprog54]

In htacess.txt are saying


# # Can Be commented in October if Causes errors, see notes above.
Options + FollowSymLinks

#
# mod_rewrite in use

RewriteEngine On

Now how do I define the directory?

[Skizzerz]

not htaccess.txt, .htaccess (they are different files). And please post the entire contents of it.