I'm trying to download and install lion onto my computer, but I can't because I have not purchased lion from the app store

I have erased my hard drive, so I can't buy it from the app store, even so - I can't find it. I do not have a disk that works with this computers software either. 

I'm a little confused by your post. What exactly is it that you're trying to do, and what OS (if any) is installed right now?
If your computer originally came with an earlier OS and you have lost your disks, you will need to obtain those to restore it to its original condition. You can buy the retail 10.6.3 disk if your original OS was earlier than that ; otherwise you will need the exact grey original disks, which Apple can provide if you call them.
If Lion is not available on the App Store, again, Apple should be able to sell you a redemption code to allow you to install it - but you would have to install 10.6 first to get access to the store.
Matt

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