How do I do a complete reset with Lion when I don't have a disc?

How do I do a complete reset with Lion when I don't have a disc (bought OS on App store).  When using OS X Snow Leopard I get the message "not allowed".  Is Lion available on Disc? Don't really want to buy it again...  The only way I can see doing this is booting from an OS disc.

What exactly are you trying to do? Reinstall Lion clean, IE without first loading Snow Leopard?
Or are you trying to go back to Snow Leopard as the operating system.
If you want to reinstall Lion your best bet is to go through the downloading process and SAVE that file and then use LionDiskMaker ( a small program) to make a Lion install USB thumb drive. Then wipe the drive and do a complete clean reinstall.
If you want to go back to Snow Leopard you will need to boot the system from the SL DVD and again Wipe the drive and then install SL.

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