Do I have to do anything to my harddrive before installing lion?

I want to clean install Lion OS X using lion recovery HD (the one that you have to push command+R at startup). Everytime I try to install a brand new clean copy, when I get back to the computer I find it restarted to my old desktop. Do I need to erase the items using Disk Utility before installing a new version?

Yes, by default the installation just replaces the OS and doesn't delete any of your data.  If you want a clean install, erase the partition with disk utility.
Captfred

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