Some of the manufacturer installed programs are really not required. They need to be removed.
Windows 8.1 has a built in Windows Defender which is the Anti Virus Program. It is better to remove the Anti Virus installed by the manufacturer.
You can remove Programs and Features through the Control Panel.
2. Select the “Programs and Features” option in the Power User Menu.
3. Select the Program to uninstall from the list of installed program displayed.