TurboTax Installation Hangs at 0%

The Windows Installer is damaged.

Follow these steps:

1. Press Ctrl-Alt-Del, and then select Task Manager.
2. Click the Processes tab, and then click Image Name to alphabetize the processes.
3. If msiexec.exe is in the list, select it, and then click End Process.
   
4. On the Windows taskbar, click Start, then Control Panel.
5. Double-click Administrative Tools, and then Services.
6. Locate and open the Windows Installer service.
7. Verify that the startup type is manual and the service status is stopped.
   
8. Install (or update) TurboTax.

If the same problem persists, download the Windows Installer.

And if that still doesn't help, follow the steps on the Microsoft site.