I'm guessing someone is trying to upload the file, although it's incomplete, I would try removing uploads then deleting the file. If that still doesn't correct the problem I would suggest doing a full uninstall of limewire, this means removing it from it either by all programs or add/remove programs, remove all java updates and the java runtime environment, then remove all files and folders from progam files including incomplete folder (which will either be located in C:, My Documents or Desktop, then reinstall Limewire (Java will install with installation of Limewire).