2 options: 1. Go to Start menu>Programs>LW>uninstaller. 2. Go to LW's program folder & locate the uninstaller.

Something else you could do is this: delete your LW Preferences folder whilst LW is closed; instructions here: Fixes for Limewire

The reason for your corrupts could be multiple reasons. eg: Your firewall or AV program are'nt configured properly to allow LW full access. Or the files you're trying to downld are deliberately corrupt (from the RIAA), etc. See the Sticky here: Downld/Upld Problems Sticky