Hmmm...well I can tell you to Absolutly Stay away from Files that are 3462kb's and 5611kb's. These are Known Viruses, Fakes, or Corrupt.
I don't use LW any longer so all I can advise here is to use the Forum Search Function to help solve this issue. I still think the Problems you are experiencing are do to Bad Files. I hope that you are Scanning EVERYTHING that you are D/Ling Before you Open them. The Network is Flooded with Fakes, Worms, Viruses, and Corrupt Files in an attempt to deter Filesharing.
