While the InstallShield Wizard is preparing, the process stops and I get a message saying "An error occurred while downloading the file http://www.installengine.com/cert02/.../isscript.msi. What would you like to do?" My choices are to cancel or retry but retry just keeps giving me the message.

Any ideas on how to get past this?

Thanks for the suggestion on the firewall. I have Norton Personal Firewall. When I change to "allow traffic" I loose my internet connection completely. When I change to "block traffic", I can't install the program. So, I uninstalled the firewall and have successfully installed Limewire. Thanks for the help!