How do I reinstall mac os 10.7, if I don't have a backup?

I had to reinstall mac os 10.6 to my macbook, which was running mac os 10.7 before, coz, all of a sudden,  it could not be booted. Now I would like to know, how I can reinstall mac os 10.7. which I bought in the app store. It doesn't work from my backup medium. Do I have to buy it again on a DVD?

The Mac App Store was released with 10.6.6. It is most certainly on 10.6.8.
The Mac App Store has nothing to do with iTunes. You access the Mac App Store from the Apple menu:
You don't need an install disk inserted for the Recovery HD or Internet Recovery.
If your Mac came with Snow Leopard installed, then it likely doesn't have internet recovery. There were EFI firmware updates that enabled the recent ones to have internet recovery. So, if that is working (ie you get to the internet recovery screen holding down cmd-R), but your wireless password doesn't work, then disable you wireless password for the moment.
Or, is it your AppleID password that doesn't work?

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