In rare cases, the Iron Speed Designer installer can hang on the first step (preparing to install). Sometimes your processor takes up 100% of the CPU for an extended period of time during the first step.
The InstallShield support knowledge base recommends that you disconnect your Internet connection and try installing again. You can simply “pull the plug” or go to your Control Panel, Network Connections and temporarily disconnect the LAN adapter. Make sure you download the full installer on the local disk before you disconnect. You can download the full installer from:
Iron Speed Designer (full installer):
http://www.ironspeed.com/download/Iron_Speed_Designer_Installer.exe