Changing identity of a legally purchesed used MacBook

Hi folks.
I have just returned to the Apple wprld after too many years in the Windows netherworlds. I am currently an English teacher in Bandung, West Java, Indonesia.
I have purchased a used MacBook 2,1. It is running 10.4.11.
It was a completely legal purchase with bill of sale. Unfortunately the original OS discs were damaged.
I wish to change the name of the computer (when I bring up About this Mac and more info, the original owner’s name comes up.) Additionally, I’d like to change the registraton at Apple’s database.
The OS and software are all working great so I am hesitant to reinstall everything and start from scratch. Can I change the identity entered on the original set up?
Thanks for your tolerance if is a too frequently asked question.
Bob White

You should get a set of replacement install discs (Apple might replace the damaged ones for you for a small shipping fee), or a newer retail OS X install disc, and reinstall everything from scratch.
When acquiring as used Mac, there's no way of knowing what kind of hacks, security holes, malware, pirated software, or any other junk that may have been left on it by any previous owners. That's why it is very important to wipe a used Mac clean and reinstall everything from scratch before using it. Otherwise you are taking a very high security risk. I wouldn't put any personal data on a used Mac, or even connect it to the internet, until a wipe and reinstall.

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