Need help with running scripts in WAMP

[sitemasters]

I need someone to help me with WAMP.

The root directory is wamp/www/ which is default and I tried to load a script which I downloaded from the net. I tried copying the entire contents of the script to wamp/www/ folder and then accessing http://localhost/myscript/install/index.php . I just get the following error message:

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.

I have configured WAMP properly. I'm able to see the test page when I goto http://localhost.

File/folder permissions are set correctly. All files and folders have read/write permissions.

My apache error log shows the following error.

[Sun Jan 18 17:09:55 2009] [alert] [client 127.0.0.1] D:/wamp/www/myscript/.htaccess: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included in the server configuration

What is the problem? Am I doing something wrong?

Please help.


Thanks in advance.