I've used Shareaza for a long time, and have always liked it (definitely the best P2P software). As long as I've used it, I've always had a weird error pop up every single time a download completes, and I finally decided to ask about it. I've attached it to this post, so check it out and let me know what I can do. Thanks!
This Shareaza 2.4.0.0 running on Windows 2000 SP4.