cpu crashes when i plug in internet/ ethernet wire

My cpu runs fine until i plug in the internet. When i do the physical drive the memory and the cpu core all go to 100%. The cpu slows to a crawl. when i try to open applications with internet plugged in the programs freeze. when internet cord is unplugged everything works well



I have McAfee on CPU. could not get to scan uninstalled. attempted to install avg i could not. to run the scan u recommended i had to download thru another cpu and transfer over

I tried doing net stop...

cpu crashes when i plug in internet/ ethernet wire