Can Someone Hack Into My Dongle IS SOMEONE HACKING INTO MY COMPUTER?? PLEASE HELP?

IS SOMEONE HACKING INTO MY COMPUTER?? PLEASE HELP? - can someone hack into my dongle

My computer still seems .... Widnows has found another computer with the same IP address that linked the computers on the same network, but I'm the only one with the Internet because it is a mobile broadband adapter .. please .. I am very concerned, can help others access the dongle does this by phone?