reporting service doesn't work after I chnage my destop name.

here is the message I got.
Is there any way to fix the problem?
==============================
The report server cannot open a connection to the report server database. A
connection to the database is required for all requests and processing.
(rsReportServerDatabaseUnavailable) Get Online Help
a.. Login failed for user ''. The user is not associated with a trusted
SQL Server connection.In reporting services 2005 you can use the configuration manager to fix this
up. In RS 2000 you have to modify a config file, which unfortunately I don't
remember. I renamed a server but that was for RS 2005 and I could use the
gui tools to fix it.
Bruce Loehle-Conger
MVP SQL Server Reporting Services
"MS newsgroup" <klee@.jeromegroup.com> wrote in message
news:%23jgawF6xGHA.3496@.TK2MSFTNGP02.phx.gbl...
> here is the message I got.
> Is there any way to fix the problem?
> ==============================> The report server cannot open a connection to the report server database.
> A connection to the database is required for all requests and processing.
> (rsReportServerDatabaseUnavailable) Get Online Help
> a.. Login failed for user ''. The user is not associated with a trusted
> SQL Server connection.
>