It DID run in WS2003... I'm using XP pro now and it's not working. I'm currently using no proxy, no firewall, no anti-virus software, I'm having no difficulty with any other protocols. It's a fresh install of mIRC. I do receive the files, but all the open connections in that "instance" of mIRC get frozen, i.e., the channels stop scrolling, no new messages come, and the channels and everything act dead. I've had the same problem under XP Home, as well. I've installed the Windows and tried it then, to no avail, as well. Also, I'm not using any router or hubs. I have cable internet. It works fine when I boot under WS2k3, but that's no longer an option.