Recently, one of my other computers had a rootkit. I had a USB plugged into that computer for a while with some files that I needed. I finally got rid of the root kit on my main computer, but I plugged the USB that was in the computer into my macbook air to get the files I needed off of it. Now I feel like my macbook air has some kind of virus or rootkit. Yesterday I was doing some work, and I was using the calculator on the far left panel, then when I was writing down my calculations, I saw the panel switch back to the main screen by itself. I just want to make sure I did not transfer the rootkit to my laptop as well. Any help would be greatly appreciated! Thank you so much.