If you’re using a wireless router, secure it with encryption. Your internet provider will help you with that.
To actually monitor live data traffic graphically, download the free evaluation version of DU Meter. Use it for a while, and buy it if you find it useful. DU Meter is useful because its graph visually displays the data inflow and outflow from all applications on your computer.
Last, but not the least, clean your computer of all malware and spyware. Install Malwarebytes’ Anti-Malware. Run a scan. Remove all malware. Then install SpyBot. Run a scan, remove all spyware. Finally, use a good, free, light antivirus software, like Avast.
All softwares listed are free of cost, except for DU Meter, which you can evaluate for a month.
I was using spyboy, zonealarm, and AVG and all seemed to work well until this happened. My cable provider gives McAfee free of charge so I’m trying that now. I try the anti-malware and see what happens. Thanks