Sorry I should have been more precise.
I'm referring to the Focusrite web page that has the "set up your PC for optimum audio" plus all the other tips they recommend.
But just now I've opened a case with Focusrite ...I've sent them all my details so am now waiting for a reply.
But again, I'm sure this is all to do with drivers...maybe my particular PC is simply unfriendly towards them ?
I'll keep posting until there's a conclusion one way or the other.