There are two possible causes for this error:

1. The ION Setup installation was not performed by The Administrator login and UAC is enabled.

2. ION Setup was installed with THE Administrator login but user accessing Setup does not have Admin credentials.

Option A:

Ensure that User Account Controls (Control Panel -> User Accounts -> Change User Account Control settings) are disabled
and that the Windows user has administrative privileges on the machine.

Option B:

Login to the machine with the administrator account, uninstall ION Setup and re-install.

Explicitly grant permission to the ION Setup folder to any user who accesses the machine. The user must have full control
over the ION Setup folder and all child folders/objects.

Note: This option does not require UAC be disabled