Corrupted

Like a couple of threads i have read here I have managed to delete my previous version of LimeWire only to find that the latest version when down loaded and attempted to be installed 20 times constantly tells me the the file is corrupted and to download again. I have cleared out everything possible on my pc as suggested checked there is nothing in the firewall to stop it, not that i really understand that bit, but why is it the previous version installed fine and at the moment I can no longer download as I do not have LimeWire to download through??