Posted 20 August 2007 - 02:10 PM
Do not change anything in the Registry ! Who the PC says it is registered to is completely unimportant. If you really want to change the "Registered to" infor then do a complete reinstall. Formatting C: and starting with a fresh installation is always a good idea. You have no idea what problems there may be with this installation. This will remove any corruption that the previous owner may have done or have had happened to the OS. Just be sure to have the drivers ready (burned on CD) for the particular desktop model/motherboard model that you have.
If you are not going to install a fresh copy of XP then the best thing to do is to create your own User Account and then delete any/all the old User accounts. By doing this any documents, emails, etc., that you create will be associated with the new User Name and info.
Control Panel > User Accounts > Create a new account
Then, select each of the old accounts and then choose Delete this account. You may delete the files for those accounts, too, when this option is presented.