How Do I Uninstall a Systems Program On An Ibook?


I have done a foolish thing. I have my school/work iBook. I installed Panther on it. It said to archive the previous system and then install. Of course I hit that button. As soon as it installed, I the desktop window became small with a large bleck boarder around the desktop. I have looked for this system under applications, it only shows a file that says "Previous System"
I want the machine working as before. Please let me know step by step on how to do this and insure that the previous system is the one that is being used.
Do I need to do a clean install?
Than you.
Ana Maria