As far as reinstalling LW, download the "Offline" version of LW. Then reboot your computer, then install LW. The reboot should kill any java activity. Reinstalling LW will uninstall any previous versions at the beginning of installation.

If same problem, remove your Java using the add/remove control panel & reinstall it.

I hope you weren't saving your LW downloads into the LW program folder. That is a fatal mistake if you have. As suggested, search the computer using the search function for the extension of the files. eg: .mp3