Someone was jacking with the windows 2000 server and the machine no longer responds to localhost.

What do I do now??

I am getting the following error:
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Warning: mysql_connect() [function.mysql-connect]: Access denied for user: 'Administrator@127.0.0.1' (Using password: NO) in d:\inetpub\wwwroot\ubbthreads\mysql.inc.php on line 35
SQL ERROR: Database error only visible to forum administrators
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If I have to chenge something to reflect the new computer name which files do I change??

Thanks in advance to anyone who can help.

Scot