Error Viewing reports

Hi everybody,

first i am having problem viewing the reports, when i go to http://localhost/ReportServer/ i get a list of files and folders as follow:

[To Parent Directory]

01 ?????, 2007 11:14 ? <dir> bin
06 ??????, 2005 01:12 ? 488278 Catalog.sql

06 ??????, 2005 01:12 ? 14738 CatalogTempDB.sql04 ?????, 2007 05:26 ? 76 global.asax

04 ?????, 2007 05:38 ? 10540 rsreportserver.config
13 ?????, 2005 02:07 ? 11845 rssrvpolicy.config
01 ?????, 2007 11:14 ? <dir> Styles
08 ?????, 2007 09:58 ? 2776 web.config
and when i try to open any folder it shows its content, then i select any report and click on it, it gives me the following error:

An internal error occurred on the report server. See the error log for more details. (rsInternalError)

Invalid object name 'ReportServerTempDB.dbo.PersistedStream'.

could anyone help me please?

thanks in advance....

go instead to
http://localhost/reports