My limewire has detected a firewall and will not download anything. It only works about once a week, but usually is unable to download. If there is anything I could try it would sure help.

Is your connection ok (all green/blue connection bars)?
If your connection's stuffed, try the fixes in the thread below.
If LW Will Not Connect

If your connection is fine... what happens when you try to download - do files get stuck needing sources, or do they not even move into the download pane at all?

If files aren't moving into the download pane, try the advoce here:License (click)

If files sit connecting for ages & then get stuck needing sources forever, you're probably seeing fake files.

If you're searching for video files, always chech the file with Bitzi before download. If a file has heaps of sources but no Bitzi rating, chances are it's a fake.

Check out the threads below for more info & tips, including how to use Bitzi

Fake files showing up in search results

How to find music (tips for video also)

If none of that helps, please give a bit more info about exactly what's happening when you try to download & also give your system details. System details - help us to help you -> Provide these details when you post!!!