I've used Inno for years and always use this line in the Setup section of all of my Inno scripts.

PrivilegesRequired=Admin

It's mainly business software where the company have computer/software managers who don't want their users installing software without Admin permission.

Because of that I don't have any experience deploying to 'normal' users.

If I remove that line and install with 'normal' privileges how does the setup actually install anything into the Programs Files folder ? I mean doesn't UAC on Vista and Win7 prevent anything being written to the Program Files folder?

Or does the install simply create/install automatically for that user without problems ?