Restart the computer in safe mode with networking and try to run MVT and manually update McAfee and let me know the status and messsage from MVT and McAfee. Are you using Wireless connection on the computer?
PS : To enter “Safe Mode with Networking”, you need to restart the computer. While the computer reboots, you need to keep tapping F8 key on your keyboard. Then it will take you to the page (Windows Startup screen) from which you can select “Safe Mode with Networking" from the list, using the up and down arrow keys of the keyboard. After selecting “Safe Mode with Networking”, press the Enter key.Then your system will boot up in Safe Mode with Networking.