It's just viruses inside of files they want you to download. Just add exe and .exe to your filters and they will go away. You can't use exes on a Mac anyways. I added that too since I don't use LW for applications. If your not using it for apps either add these to the filters also.

Keywords to add:
exe
.exe
zip
.zip
rar
.rar
bat
.bat
dmg
.dmg