On connecting to a Windows machine, if Spotlight returns the following error:
The registry on "<<MachineName>>" is not accessible. You need to connect to this machine with an account with privileges to retrieve server information, query the registry, and access performance monitor objects.
Login to the Windows machine using an account with administrative rights.
A login with administrative rights satisfies the requirements of Spotlight on Windows, with the privileges to retrieve server information, query the registry, and access WMI and performance monitor objects.