Tengo un problema ahora con el server cada vez que intento acceder a la instalacion me sale el siguiente error

 Server Error in '/' Application.

Runtime Error

Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".

<!-- Web.Config Configuration File -->

<configuration>
    <system.web>
        <customErrors mode="Off"/>
    </system.web>
</configuration>

<!-- Web.Config Configuration File -->

<configuration>
    <system.web>
        <customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
    </system.web>
</configuration>

El CustomError mode=off y me sale este fallo siguiente 

Configuration Error

Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level.  This error can be caused by a virtual directory not being configured as an application in IIS.

Source Error:

Line 87: 	<system.web>
Line 88:     <!-- Ensure validationkey is not set to AutoGenerate,IsolateApps so it correctly supports webfarms -->
Line 89: 		<machineKey
Line 90: 		  validationKey="AutoGenerate,IsolateApps"
Line 91: 		  decryptionKey="F9D1A2D3E1D3E2F7B3D9F90FF3965ABDAC304902F8D923AC"

Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433

No se que hacer, hasta el momentoesto sin configurar la nueva ruta a la base de datos, que si la pongo me sale otra vez el primer mensaje de error

¿Cual el primer o segundo fallo?

Creo que es del IIS, creo que me dice que no lo tengo configurado, como lo puedo configurar en el server¿?

es que la continuacion el mensaje de errors es el siguiente

It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level.  This error can be caused by a virtual directory not being configured as an application in IIS. (d:\http\sites\afavitae.com\afa\web.config line 146)
It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS. (d:\http\sites\afavitae.com\afa\web.config line 209)

It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level.  This error can be caused by a virtual directory not being configured as an application in IIS. (d:\http\sites\afavitae.com\afa\web.config line 217)

                     

Y como dice que puede ser causa del IIS, lo voy a configurar. La cosa que es que no se como hacerlo. Lo malo es que las modificaciones del IIS me la hacen los del servidor,¿ por favor me podriais decir que es lo que me tienen que hacer? es que es la primera vez que lo instalo de forma remota asi que no se como instalar el dnn con el IIS, muchas gracias chavales que sois los mejores.