program wants to stay online

i go online, but when i disconnect and keep on working on the pc or just leave the computer on. then in about 5 to 10 minutes it asks  "connection could not be established (or something) work offline/try again?" as if there was a program that was working online.

ive already checked everything, closed all chatting programs, made sure the browsers are closed and that there's no other program running, but it still does it. tried checking of spyware and viruses too, they both say there's nothing

does anyone know what could be happening? i havent downloaded any program or installed anything :(

Stop using Internet Explorer

Task Manager

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