Can't change the rewrite rules

[eluser]Unknown[/eluser]
Hi guys, it has been 6h thath im trying to edit my path from localhost/index.php/.. to localhost/.. I've created a .htaccess file in the same derictory of system which contain:
Options +FollowSymLinks
Options -Indexes
DirectoryIndex index.php
RewriteEngine on
RewriteCond $1 !^(index\.php|images|robots\.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L,QSA]

Im using wampserver and when i try to log into localhost I get this msg error:
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, admin@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

CAN YOU TELL ME PLEASE WHAT WRONG WITH THIS F*** CODE