On 4 Jan 2018 18:15:18 GMT, KenK wrote:

I didn't know you could change the serial number. I thought that was hard-
co0ded into the install disc.

Not really, any code for that version will work, at least these days
but if you have an OEM code it will not work on a retail version, Home
and Pro are not the same etc. Most Pro codes I have to seem to work on
the HP disk I have tho. Dell seems to be the weird one. The HP version
will run on a Dell with a HP/Compaq code.
It appears MS is not doing any of that hardware matching that was so
troublesome in the past.