internet usage

I'm having some throuble trying to figure out what is going on... Maybe someone here have some answer or can help me with some troubleshooting... I've upgraded my local networking of 50mbps to 300mbps and the chaos begins! When I do any internet speed test, my computer starts to do some random...

It's been 3 days since i have noticed it. One day my internet was working really slow so i went to task manager and saw that something is using all of my data in background. I couldn't figure out what was wrong so that could kill it from task manager. Please help me with this, its affecting my...