What do you mean they're corrupted? What program gives you that message? And under what conditions?

If it was when you downlded them thru LW, then it might be due to something as simple as the hash tree didn't agree with the original one that was downlded the moment you selected the file to downld, but in the meantime someone has changed the id3 tag. It's when the hash tree comparison is wrong that you usually get that message. But the difference might be a single bit or byte or few or could be many. It depends upon whether the difference in data has damaged the file or not. It's not always easy to know. For that reason I always continue with files that get the corruption detected message. And then check them at the end to see if they're usable or not.