I have version 10.5.8 and I can't seem to install Lion

I need some help. I have Lion on a usb stick and i'm trying to install it to my OS X 10.5.8 but it keeps telling me I cannot use this version of OS X with Lion istall. Please Help!~

Phoenix,
Like the others mentioned you need the 10.6.8 version to do an upgrade over your existing OS.
Have you tried a clean install after backing up your data and erasing your HDD? I'm assuming your hardware qualifies. If your USB stick is bootable you could do a clean install with it. Or if you have the InstallESD.dmg file, burn it to DVD and perform a clean install.

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