My computer shout down during the instalation and now there's no lion on the computer and can't download again from applestore as it says it's "installed"

During the Lion instalation my computer shout down and there's no instalation done. I've looked for any instalation file on "downloads" but nothing appears and when trying to start from zero on the apple store... it says "installed" so can not do it!
please please help!!!!

Try resetting your device.  Hold down the power button and the Home button on your iPad, ignore the slide to power off message, continue to hold both buttons until you see the white Apple logo. After it restarts try download the Facebook app again.

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