INTERNET UNPLUGGED-DOWNLOADS STILL COMES ON MY COMPUTER

I HAVE GOT A TEST FOR EVERY ONE TO DO.I ALWAYS UNPLUG MY INTERNET FROM MY COMPUTER WHEN I'M DONE FOR THE NIGHT OR DURING THE DAY ALSO.WHILE ITS UNPLUGGED I NOTICE SOMETHING IS BEING DOWNLOADED TO MY COMPUTER.SO THEY (WHOEVER)CAN DOWNLOAD STUFF ON YOUR COMPUTER EVEN WHEN THE INTERNET IS NOT CONNECTED.I SHOULD KNOW IT HAPPENS EVERY DAY TO ME WHEN I UNPLUG THE INTERNET FROM MY COMPUTER.I WILL LEAVE THE COMMENTS OPEN ON THIS ONE TO GIVE ME TIPS ON HOW TO STOP THIS FROM HAPPENING AND TO WARN PEOPLE THAT IT CAN HAPPEN TO THEM TO.