You would have to select Activate by Phone and give them a call. They can
activate it for you with no problem.
As for why it lost the activation? Windows Activation is a controversial way
of stopping piracy and for some people, very buggy. Some have to reactivate
after a Windows Update, which isn't supposed to happen.
"markfsmf" <email@example.com> wrote in message
>I have installed vista on my computer at home and thought that I had
> registered it after installation. Now it it telling me that the
> key for that copy of Vista is already in use and I need a new copy or new
> What do I do? This copy came directly from Microsoft......