There is no "de-activation".
The way activation works is that when you activate with a particular product
key, that information is kept in the activation servers at Microsoft. The
activation information is reset on the activation servers every 120 days. If
you activate again before 120 days has passed, the automatic internet
activation will fail and you will be required to use the telephone to
re-activate. If it has been more than 120 days, the automatic internet
activation will work.
"Noel" <Noel@discussions.microsoft.com> wrote in message
> Hello, I put together a new machine and decided to put Vista on it; anyway
> the raid drivers were a littel flaky and my drives corrupted. I had to
> recreate the array.
> I wasn't able to reactivate, the internet activation failed, even though
> there were no changes to the machine (except the raid volume was
> using the phone system worked.
> To avoid this in the future (ie what if my drives fail and I have to
> reinstall) how do I
> "De-Activate" Vista?