Manditory key change

I do some repair and clean-up for customers and friends of friends. Often,
but not always, I have to format and reinstall the OS. At this point, I
have to track down the owner's key and said owner is not available or can't
find the key in a timely manor so I'm at a standstill. Often the box is so
bad I can't extract the old key or I forget.

Is there a way I can do the install using a "temporary" key to finish the
install then when the owner first starts-up, he is FORCED to enter his
registered key and the "temporary" key goes away and can't be used? This
way I could have the OS and all apps. installed and functional and the owner
is registered and legal. I know there are a bunch of key changers out there
and I could start one on "start up" but I want to make sure the owner can't
blow by it or reuse the "temporary" key.

If there are no major hardware changes, it shouldn't be a problem but what
if there are big changes and Windows would normally want to re-register?
Can I make it go through the registration process?

I do try to get all the original disks and keys but we all know how that
goes.

(Thanks for all the help over the years and thanks for the colorful
vernacular)


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