Help!

So, my computer has been being weird lately and I've ran virus scan after scan but there's no viruses, some input please? I've not downloaded anything that would give me viruses either.

This box and also a Javascript error thing pop up all the time. They go away for a few minutes and then return.



Then today, I saw an icon at the bottom of my screen that I usually don't see, so I clicked the little arrow thing and then this popped up:


I'm really not sure what the heck is wrong with my computer, but if it's not a virus then what the heck is it because I need to know.