One last thought (Thanks OAH)

There is one other location shared, but if your incompletes somehow ended up there then we got a serious bug and would like to know

1. what version you are using
and 2. where you got it

Go to

C:\Documents and Settings\**Your Username**\Application Data\LimeWire\.NetworkShare\Incomplete (the folder is hidden, so you have to enable "Show hidden files and folders" in Start-->Control Panel-->Folder Options