What file extensions are you downloading...are any files changing to .zip? LW will give you that error message if you try to launch .zip or .rar files. If your file extensions are changing then something's fishy.

Have a look here, see if that advice helps (download AVG free, update it & scan your computer). If not, post back & let us know
http://www.gnutellaforums.com/showpo...60&postcount=4