OK so i humbly beg forgiveness, a .dat is not an .exe, but it showed up in my downloads folder immediately after i had entered username-password in a pop-up box. I didn't download it, and Limewire has a few .dats in other folders, but this wasn't a Limewire file. When i accessed it, its properties were 'hidden' and 'system' and I got the warning "these files are used by the operating system and by various programs". Since i didn't download it, and it wasn't a signed windows file either, i said 'bugger that' and deleted it. HAS ANYBODY ELSE FOUND IT? This could be nothing but someone has activated the old private network and are using it to annoy others P2Pers, but i'm not taking any chances. When the boxes pop-up, hit 'Alt-F4' to shut it off.