If you are using ZoneAlarm firewall, the program conflict is the cause. You can either shut down the firewall while you are downloading or switch to a different firewall. Sygate personal firewall works allright and you can download it from CNET (download.com). NOTE: if you are using ZoneAlarm and want to uninstall it, visit its website for detailed uninstallation instructions. Don't just use add/remove program. Otherwise, you could crash your computer.