Asus P9D-C/4L - Manual (Page 136)

6-12 Chapter 6: Driver installation
9. When the installation of files is finish, click
Next.
10. When prompted to restart the computer,
select Yes, I want to restart this
computer now then click Finish to
complete the installation.
8. Click Install in the Windows Security
window.
The Windows Security window may appear more than once and you may have to click
Install several times to continue with the installation.