problems uninstalling SCVMM 2012 RC

Hi,

I'm currently trying to uninstall the SCVMM 2012 RC, but before I pass the page Retain/Delete DB, the wizard dies, I've check the log SetupWizard.log, and it shows this error.

09:20:10:Uncaught Exception: Threw Exception.Type: Microsoft.VirtualManager.Utils.CarmineException, Exception.Message: VMM cannot access registry key value MachineName under Software\Microsoft\Microsoft System Center Virtual Machine Manager Server\Settings\Sql.
Verify that the registry key value exists, and then try the operation again.
09:20:10:StackTrace:   at Microsoft.VirtualManager.Utils.RegistryUtils.ReadRegistryValue(String key, String valueName, Object defaultValue, Boolean throwOnError, RegistryKey rootHive)
   at Microsoft.VirtualManager.Utils.AppSettings.get_SqlMachineName()

I've try adding the key MachineName to Software\Microsoft\Microsoft System Center Virtual Machine Manager Server\Settings\Sql. but the error still appears.

anyone can help me with this?

Diego