My old computer dropped

Yesterday, I took a classmate U disk inserted above my computer, copy the inside of things when all of a sudden resumption of the (I installed NOD32 is not to kill soft tips of toxic) and then my computer on the regular 10 minutes to 3 minutes of break Which of the net

errant
help me with the school's campus network

What do you use the Internet.NIC is not the USB wireless network card?
If U set free plug, remove the hardware and not through security.
Easy to make USB devices work for the time being interrupted, leading to break