Sharepoint 2010 Development environment setup error - Stand-alone provisioning has failed because an error occurred while enumerating the SharePoint Server products installed on this server

I have the same problem as this http://social.technet.microsoft.com/Forums/en-US/sharepoint2010programming/thread/42239d23-26cd-4571-a4ac-b3bc74f9ad3a/ (hence the same title)

Definitely not a license key issue. The only other thing I can think of is that I have Office 2003 installed on my machine?

For information what I'm trying to do is this:

- Install Sharepoint Server 2010 on my local Windows 7 (64 bit) machine
- Already have the pre-reqs installed
- Have followed these instructions - http://msdn.microsoft.com/en-us/library/ee554869.aspx to the letter
- Am connecting to the internet via a proxy but have run Fiddler alongside installation / configuration and no errors (407s)

Any help would be greatly appreciated!!

Thanks, Rob

Full error: 

System.Reflection.TargetInvocationException: 
Exception has been thrown by the target of an invocation. ---> 
System.InvalidOperationException: Stand-alone provisioning has failed because an error occurred while enumerating the SharePoint Server 
products installed on this server.       
at Microsoft.Office.Server.EvaluatorModeProvisioning.OfficeServerProducts.get_OfficeProductList()       
at Microsoft.Office.Server.EvaluatorModeProvisioning.OfficeServerProducts.IsInstalled(OfficeServerProductToProvision product)       
at Microsoft.Office.Server.EvaluatorModeProvisioning.SharedEvaluatorModeProvisioning.GetProvisioner()       
at Microsoft.Office.Server.EvaluatorModeProvisioning.SharedEvaluatorModeProvisioning..ctor(TraceListener listener)       
--- End of inner exception stack trace ---       
at System.RuntimeMethodHandle._InvokeConstructor(Object[] args, SignatureStruct& signature, IntPtr declaringType)       
at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)       
at Microsoft.SharePoint.PostSetupConfiguration.ReflectionHelper.InvokeConstructor(String assemblyQualifiedName, Type[] constructorSignature, 
Object[] constructorParameters)       
at Microsoft.SharePoint.PostSetupConfiguration.TaskCommon.ReflectionHelperInvokeConstructor(String assemblyQualifiedName, Type[] 
constructorSignature, Object[] constructorParameters, TaskBase task)       
3at Microsoft.SharePoint.PostSetupConfiguration.EvalModeProvisionTask.LoadProvisioner()       
at Microsoft.SharePoint.PostSetupConfiguration.WelcomeForm.ShowNextFormForServerRoleSingleServer()       
at Microsoft.SharePoint.PostSetupConfiguration.WelcomeForm.PsconfigBaseFormNextButtonClickedEventHandler(Object sender, EventArgs e)       
at System.Windows.Forms.Control.OnClick(EventArgs e)       at System.Windows.Forms.Button.WndProc(Message& m)       
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)       
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)