I've been using your advice earlier for the filtering/keyword searches and slowly I am learning how to navigate a little better- my new question is how do I delete corrupt files that tell me "cannot delete, may be in use by another application"? I know they are not in use by any application of mine, but how do I delete them?

If the file is incomplete, go to your LW library, click on 'Incomplete Files' & then click Explore...your incomplete folder will open outside of LW. Keep that folder open, close LW & once LW's closed, delete the file from your incomplete folder.

If the file isn't incomplete, go to LW's library & click on Saved Files, highlight the file & click Explore....same deal when the folder opens; completely close LW & try to delete from the saved folder.

If that doesn't work, try deleting in safe mode or use one of the utilities in this thread below.
Incomplete Download File won't delete at all.