Reformat IMAC

Hello,
I tried reformatting my IMAC with the CD that came with it and after the install, I still have the same info.  The CD that came with it is the MAC OS and application CD, is there another CD I am missing?
Thanks in advance.
Becky

Ok, now I understood the problem. You should perform a clean installation of the operating system. If you have upgraded to Lion, you can't perform a clean install, because the only option you have is to perfom an upgrade. I suggest you two way:
Reinstall Snow Leopard: boot your iMac with the installation DVD inserted, holding the letter C right after the chime sound. Your iMac will boot into the the installation process. After choosing the language, the first window of the installer shows up, and so does the "application bar" on the upper side of the screen. You should find the Utility menu, and under that the Disk Utility: there you can complety erase all of the data in your HD. After formatting, you can start the installation process. When finished, you should install all of the updates available and then upgrade to Lion.
Create a bootable USB pendrive of Lion (Recomended, time saving): by following this guide http://osxdaily.com/2011/07/08/make-a-bootable-mac-os-x-10-7-lion-installer-from -a-usb-flash-drive/, and perform a clean install of Lion. Like before, once the setup is loaded, you should format your HD like said before.
Let me know if that works!

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