Error when connecting to localhost.

Error when connecting to localhost.

Hello, I am having problems logging into server localhost. Appears the following error message ...

Until entering the service center, gives the following error... 

Configuration Error Description: An error occurred during processing of a configuration file required to service this request. Examine the specific error details and modify your configuration file appropriately. Parser Error Message: Unable to connect to database Session.

Source Error:

				Linha 20:     <sessionState cookieless="false" regenerateExpiredSessionId="true"  mode="Custom" customProvider="OutSystemsSessionProvider">
Linha 21:       <providers>
Linha 22:         <add name="OutSystemsSessionProvider" type="OutSystems.HubEdition.RuntimePlatform.SessionState.SqlSessionStateStore" />
Linha 23:       </providers>
Linha 24:     </sessionState>

I installed the version 7.0 platform.

Could anyone help me how to solve this problem?

I try to install Outsystems 7.0 platform on Windows XP Professional SP3 and I have exactly the same error. The installation of Service Center fails due error code 100 and I'm still trying to find a solution.