Vizio CT14-A0 - Windows 8 Installation Guide - Manual (Page 5)

8. Next, select Uninstall next to Intel(R) USB 3.0 eXtensible Host
Controller Driver. Then select Next to begin the uninstall.
You will be prompted to restart your computer, select No, I will
restart this computer later select Finish.
9. Next, select Uninstall next to Microsoft Security Essentials. Then
select Uninstall to begin the uninstall.
When the uninstall completes, select Finish.