Cheers, I've always used comodo, but its out because it messes with critical Vauxhall installations I rely on for various different things, despite several hours trying to locate the issue and resolve it.
I thought for a while after elimating various other issues/thoughts that it might be Comodo's specialist DNS re-routing system, but even with stopping that and keeping my normal DNS settings, its still not allowing me to run two essential programs - So makes it un-useable.
Will check that link Mark, thanks mate.