How do i save my pc and stop it from dying?!?

Hello, I currently bought a computer and i installed all the anti-virus and other software. I want my internet to work but when i go to my hardware files. Ethernet Controller and Bus Controller and 2 other software have a question mark next to them. It says that there is errors installing it. Yes, i uninstalled it and installed it back but it wont work. i still cant go on the internet. btw, i bought the computer in different parts. Like i have HP Procesor and BenQ Monitor. Does this change anything? Please Help me solve this problem Thank you, Bakhti Mirzo

_________________
satellite tv for pc