Internal error 500

Hi

I am working on a very small website that has a few pages. The website goes down very often.

Web host - go daddy. When I checked with them they say it is possibly to do with the rewrite rule in the htacess file:

This is the file in the root directory:
---------------------------------------------
AddHandler x-httpd-php5 .php
AddHandler x-httpd-php .php4

RewriteEngine on
#Added to keep from getting 500 errors at godaddy/ Clean URLs enabled
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?q=$1 [L,QSA]
----------------------------------------------

What should the rewrite rule be?

I am not able to figure out the issue (php beginner) prompt help will be totally appreciated.

Thanks