Did you install from the CD? Or did they have you try installing from the download? The CD has instructions for downloading instead. Although there is a problem registering for the download if you already used the CD. I assume you tried turning off your antivirus, clearing the cache, etc?
If you are having trouble uninstalling and reinstalling the program see this….
https://ttlc.intuit.com/community/installing/help/forcefully-uninstall-and-reinstall-turbotax/00/260...
Are you on Windows? Have you seen this one?
Windows Troubleshooting Installation…..
https://ttlc.intuit.com/community/troubleshooting/help/troubleshoot-installing-and-running-turbotax-...
