atlasprince

well i tried some tools from kaspersky like sality virus killer and they were very effective now everything is fine and malwarebytes detect nothing but if i try to start my pc from safe mode it give me a blue screen of death

malware bytes keeps show me the same results after every scan i do in my pc and i want to use my pc in university its an old pc under windows xp its works well for what i do with it but this trojans are driving me crazy and i really need to get rid of it since i need to plug my usb for my homework... please anybody can help me ?