Actually I started using InstallShield Express awhile back but not because of errors on different platforms. You might want to try that and see if it clears up any errrors that occur during setup. It won't help you with other errors however but once you get used to using it you'll find it is much more flexible than the setup wizard.
Eric Kleeman - EDS Consulting Services
MCP Visual FoxPro
MCSD C#.NET
Hua Hin Thailand
Los Angeles California