Advanced Guestbook 2.4.1 error

MySQL Error : Database Error
Error Number: 1044 Access denied for user: 'root@localhost' to database 'guestbook'
Date : Tue, June 20, 2006 18:20:05
IP : 83.176.55.177
Browser : Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
Referer : http://paulo-*******.com/livro_t/install.php
PHP Version : 4.3.11
OS : Linux
Server : Apache
Server Name : paulo-********.com

assistance please

Thank you

During the installation I had the error:

MySQL Error : Database Error
Error Number: 1044 Access denied for user: 'root@localhost' to database 'guestbook'
Date : Tue, June 20, 2006 18:20:05
IP : 83.176.55.177
Browser : Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
Referer : http://paulo-*******.com/livro_t/install.php
PHP Version : 4.3.11
OS : Linux
Server : Apache
Server Name : paulo-********.com

can you help me to resolve it?

And you posted the same message twice because? The error message says it all

Access denied for user: 'root@localhost' to database 'guestbook'

Put your database info into the config.inc.php file.