What are warning signs of Trojan horses?

Symptoms A list of common symptoms is described in this section. •Wallpaper and other background settings auto changing •Mouse pointer disappear •Programs auto loading and unloading •Strange Windows warnings, messages and question box, and options being displayed constantly •e-mail client auto sending messages to all user´s contacts list •Windows auto closing •System auto rebooting •internet accounts information changing •High internet bandwidth being used without user action •Computer´s high resources consumption (computer slows down) •Ctrl + Alt + Del stops working