Start by doing nothing - for now. It isn't clear what the problem is. Explain in more detail what you have done and use exact terms that you see in Lightroom - "downloaded" for example isn't used in Lightroom and we're only guessing what you mean by it.
I imported my whole pic library from my hard drive. I was able to find a solution onliine. I hit ctrl/a and then pressed delete on my keyboard. Voila....all gone! Thanks for replying. I will be spending time learning about the program as I am a complete beginner to the program!