Someone hacked my computer and set up a new administrative account by re-registering my computer. I can not access this account nor delete it. How can I fix this and get my computer back to the way it was?

Someone hacked my computer and set up a new administrative account by re-registering my computer. I can not access this account nor delete it. How can I fix this and get my computer back to the way it was? And also prevent this from being able to happen again. I have the link the kid used (http://www.ihackintosh.com/2009/05/how-to-hack-the-user-password-in-mac-os-x-wit hout-an-os-x-cd/) Apparently he used hack 2. HELP PLEASE!

Not sure why you can't delete that account. If you have admin privileges, you should be able to. Sounds like you only removed the Home Folder for that account.
You should highlight/select the account you want to remove and then click the minus button. Might need to unlock the padlock with your admin password.
Have a look at these articles from Apple, if necessary.
http://docs.info.apple.com/article.html?path=Mac/10.5/en/8235.html
http://docs.info.apple.com/article.html?path=Mac/10.5/en/8162.html
http://support.apple.com/kb/DL1399

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