I took Lion off my Macbook Pro and put Snow Leopard back on and now I can't access Mail or iPhoto. How do I get Mail and iPhoto to work with the Snow Leopard I just put back on?

Hi. I was having slowness problems with my Macbook Pro and thought I would re-install Lion but put Snow Leopard back on by mistake. I bought the computer used with Lion on it and don't have access to the USB drive or a username/password to reinstall Lion. Now I can't access Mail or iPhoto since I put Snow Leopard on.
Is there a way to get my Mail and iPhoto working again with Snow Leopard or do I have to "re-upgrade" to Lion?
Thanks!
Steve

You can't. When you converted those libraries to Lion's format, you lost the ability to go backwards. Unless you saved a bootable backup./clone or Time Machine backup of your previous SL installation, you're up the proverbial creek w/o a paddle.

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