Norton removal tool (from Majorgeeks).
McAfee removal tool (also from Majorgeeks.)
Both AV vendors have the exact same tool - which is updated periodically - on their support pages. I have linked the MG pages simply because they are a little easier to find and download from.
You can have one (and only one) AV resident on the computer. This is probably why you are experiencing the internet problem.
Choose one AV to retain and keep it; uninstall and run the removal tool for the other.
What other security programs are installed?