Although, the 'solution' was informative, it did not solve the problem for me.
Success came after a long support session with TurboTax technician engineer NGOZI;
My situation installing 2018 TurboTax Premier on Windows 7 pro 64-bit system.
(some folders may be hidden)
navigate to the folder: c:\programdata\intuit
right click on folder: TurboTax
select option: Properties
Click on the tab: Securtity
Click on the button: Edit
Scroll to select: Users (your system name)
Select 'check' box to: Allow Full Control
Click on button: Apply
FIXED!
