Did you purchase and download the 2017 Home & Business Edition from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
If so, when you install the software the program should prompt you for a New Tax Return not an amended return.
Contact TurboTax support for assistance with this problem.
Use this website to contact TurboTax support during business hours - https://support.turbotax.intuit.com/contact/
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax