Quality column with a tick

In Limewire, I have a problem with ticked items in the Quality column. Every time I try to redownload the file with that tick, it says I already have that file, with an entirely different file name, for instance, I try to redownload *****.mp3 that has a tick, it will say that this file is already in the folder, under another name, and when you actually click to continue, the file is in a format that is not recognised in any player. I have reformatted my HDD several times, and Limewire seems to keep the info off-line somewhere, and this causes it to give that error message. Is there a way to clear the download history, as I think this will solve this issue? In other words, getting rid of the ticks.
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spam ... it will be a certain 'small' size, just ignore it. It will show in every search you do no matter what. Beware of Fake files in search results

You don't seem to get what I was saying. I downloaded those files in the past and reformatted my drive, but Limewire says I already have that file when I retry to download it. Small size? Wrong. It's the same size as the file in the search list. How does that make it "spam"?