Well installshield is screwing me over. Every time I try to install or uninstall anything I get this error. I looked at Q108322: Update to the Latest InstallShield Installation Engines but the list of version fixes only goes up to 11 and the version of the CoD4 patch I was trying to update and the mouse driver I was trying to install are 12. I even tried doing the update for version 11 and I get this error as well as when I deleted the engine and tried to reinstall that. Anyone have any ideas? I did send an email to the company that runs installshield but no reply yet.