MS SQL Server Reporting Services error: The report server has encountered a configuration error

After install of the Sql Server 2005 I got the error:

The report server has encountered a configuration error. See the report server log files for more information. (rsServerConfigurationError)
Access to the path 'C:\Program Files\Microsoft SQL Server\MSSQL.3\Reporting Services\ReportServer\RSReportServer.config' is denied.