How do I retrieve Lightroom access after a power outage?

The power went out while I was uploading RAW files from my memory card to Lightroom 5 and now I'm getting an error message that reads "Lightroom encountered an error while reading from it's preview CACHE and needs to quit. Lightroom will attempt to fix this problem the next time it launches." I rebooted the computer twice and I still get this message. I click out of the message and Lightroom closes out so I can't access anything in Lightroom right now. Help please!

Delete the preview cache (it's a folder whose name ends with Previews.LRDATA)

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How do I retrieve Lightroom access after a power outage?

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