For this issue, looks like Windows Authentication is enabled but your Windows login is not yet added to Orion Web Console. Try to disable Windows Authentication by running Configuration Wizard:
1. Run Configuration Wizard (Start>All Programs>SolarWinds Orion>Configuration and Auto-Discovery)
2. Select Website
3. On the Website Settings, select No to disable automatic login using Windows Authentication
4. Complete the configuration Wizard
If you want to Enable Windows Authentication, you'd need to make sure the Windows login you're using is added to Orion.
Creating New Accounts
http://www.solarwinds.com/documentation/en/flarehelp/npm/#OrionCoreAGCreatingNewAccounts.htm