We have been using ESET for a couple of years now and just made the change to version 4 Antivirus. Ever since we switched, every machine has slowed dramatically during normal operation. If I uninstall version 4, the slowing goes away. This behavior happens on Windows XP SP3, Windows Vista Business, and our Server 2003 and Server 2008 machines. Even when I 'temporarily disable antivirus protection' the slowing is still there (though not quite as much). We have always been happy with this product in the past, however this version seems to have some serious issues. Since it doesn't happen with just a single machine (it happens to every machine in 3 locations), I can't see it being an overlooked setting or anything of that nature. Has anyone else experienced these problems with version 4?