Try to install with these steps:
You must install using Administrator privilege.
First disconnect from the Internet so you can safely disable your antivirus and firewall software programs.
Close any other open programs.
If installing from a downloaded installation file, then double-click the file to start the install process, then skip the CD steps below.
If installing from a CD, insert the CD. It should start installing automatically. If it doesn't, then launch the CD this way:
Hold down the Windows+R keys to open the Run window.
Click Browse, and then navigate to the TurboTax CD on your CD/DVD/RW drive (usually Drive D).
Double-click the setup.exe file.
Click OK to launch the installer.
After installing, be sure to re-enable your antivirus and firewall programs before connecting back up to the Internet.
Reboot (restart) your computer.
Open TurboTax and run the updater.