Installation components ArcGIS Server 10 and ArcSDE 9.3.1 to build Silverlight app

[SantoshV]

HI,
I have installed ArcGIS Server 10 on Oracle 11g R2 along with ArcSDE 9.3.1

I am experiencing trouble in create routes(Arc Toolbox)
is my installation combination right? or do I need to use Oracle 11gR1 as database server

also I am unable to find ArcSDE 10 download from www.customers.esri.com

Please guide I am stuck here

[JenniferNery]

You can refer to the following install guide: http://help.arcgis.com/en/arcgisserver/10.0/install_guide/arcgis_server_net_install_guide/index.html...

The following are ArcGIS Server 10 System Requirements: http://resources.arcgis.com/content/arcgisserver/10.0/arcgis-server-server-requirements

Your question might be best answered in these two forums:
http://forums.arcgis.com/forums/14-ArcGIS-Server-Installation-Configuration
http://forums.arcgis.com/forums/7-ArcGIS-Desktop-Installation-Configuration