Unregister Windows Installer, and then reregister Windows Installer. To do this, follow these steps:

3) Unregister Windows Installer, and then reregister Windows Installer. To do this, follow these steps:
1. On the "Start" menu, click "Run:.
2. In the "Open" box, type "msiexec /unreg", and then press ENTER.
3. On the "Start" menu, click "Run".
4. In the "Open" box, type "msiexec /regserver", and then press ENTER.