the message is usualy like this  :

“Internal Server Error

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

Please contact the server administrator, webmaster@server3.dir4u.org 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.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. ”

don’t panic….. its actually some problem on your .httacces.

your host don’t allow some command on your .httacces

just delete line :

php_value max_execution_time 0
php_value max_input_time 0

and yor Rapidleech is normal again