"...use the HardDisks Serial nr. or something, to ensure it's only being used at that HardDisk."
I like this idea, but do you have any code that I can look at to see how this is done?

"...When setup is executed, store some of the user's system settings in the registry then whenever your App loads, compare the info in the Registry with the user's settings"
How do I do this with an Install Program? I am currently using GP-Install, and it doesn't support scripts or custom dialogs.