Trojan / Backdoor.Trojan remove (ernse.exe)

Open Task Manager by pressing (ALT+CTRL+DEL)
Go - Processes then find out the ernse.exe proces in image name.
Click on ernse.exe and press End Process

Now open My computer -> C:

In menu bar go Tools -> Folder Option-> View
Click on Show Hidden Files and Folder
Uncheck Hide Protected.....
Then Apply and ok
you see on ur c: drive a folder name users....
Just Delete it