I have been having the same problem with "corrupt files" and have noticed that even though the music track previews o/k, it gets to 99% downloaded and starts all over again until it eventually reports "corrupt file" again. Was working fine up until yesterday when i downloaded a lot of music - then almost everything I tried came back with a corrupt file - bloody frustrating!
I have now removed limewire completely (and I mean completely, run a search for any file containing Limewire and delete the lot, as well as uninstalling limewire. also check in file registry entries etc...)
Downloaded beta version and installed it, seems to be working O/K at the moment... first few tracks I'd been struggling with before are now downloaded (But I am taking the advice and avoiding T3 connections...)