I have a big problem with Reporting Services 2005 working on Windows 2003 Server.
RS work as Network service, on subdomain reporting.mydomain with SSL wildcard certificate *.mydomain,
Anonymous access: disabled and basic authentication: enabled
ReportManager and reportServer has defualt virtual folders (/reporting, /reportserver)

My problem is:
1) I can't manage security roles and site settings with report maanger. when I try assign roles to new user or group I get followng error:

"The user or group name 'BUILTIN\Administrators' is not recognized. (rsUnknownUserName) Get Online Help"
when i try to execute reports in report manager, parameters controls are not displayed correctly (very simple text boxes) and I can see:
The selected report is not ready for viewing. The report is still being rendered or a report snapshot is not available. (rsReportNotReady)

and I can't see my report in browser (IE 6.0) but only export to PDF, Excel...

other functionality are working fine i.e upload new files, creatign folders....

2) Also my reportserver virtual folder does not work correctly.
When I navigate to mydomain/reportserver I can see content of this virtual folder, than when I navigate to ReportService.soap i can see normal ReportServer view

reporting.mydomain - /Reportserver/

[To Parent Directory]

Montag, 10. April 2006 16:31 <dir> bin
Dienstag, 6. September 2005 01:12 488278 Catalog.sql
Dienstag, 6. September 2005 01:12 14738 CatalogTempDB.sql
Freitag, 21. April 2006 19:45 10555 Copy of rsreportserver.config
Freitag, 14. April 2006 17:29 76 global.asax
Freitag, 15. Juli 2005 01:12 26582 ModelGenerationRules.smgl
Montag, 10. April 2006 16:31 <dir> Pages
Montag, 10. April 2006 16:31 <dir> ReportBuilder
Montag, 13. Juni 2005 14:07 143 ReportExecution2005.asmx
Montag, 13. Juni 2005 14:06 196337 ReportingServices.wsdl
Montag, 13. Juni 2005 14:07 131 ReportService.asmx
Montag, 13. Juni 2005 14:07 131 ReportService.soap
Montag, 13. Juni 2005 14:07 139 ReportService2005.asmx
Dienstag, 13. Juni 2006 20:01 10580 rsreportserver.config
Montag, 13. Juni 2005 14:07 11845 rssrvpolicy.config
Montag, 10. April 2006 16:31 <dir> Styles
Freitag, 17. Juni 2005 01:09 2673 web.config

but me reports are not displayed correctly, I can run reports but top bar with parameters, export and print function are not displayed in correct format.
(simple textboxes, and icons)

reporting.mydomain/ReportServer - /

Microsoft SQL Server Reporting Services Version 9.00.1399.00

I think it is security issue. What schould i do to solve this problems?