Your PC may be messed up by Trojan.Zbot Activity 15:
Trojan.Zbot Activity 15 was made to execute a series of commands once infecting with the target system. It is a typical Trojan horse virus that may attack core system of Windows like Windows 7/8/XP/Vista, etc. In order to run freely to complete its tasks, Trojan.Zbot Activity 15 will make a copy of its key components under system files.
