What is the pgAgent service account? Im installing pgAgent using Stack Builder.

In one step ask me for service account. Should I use PC, Domain or DB user? Or create a new one?

I try using my DOMAIN\my.user.name  also using the postgres user and return same error. 

I dont have the PC_Name\Administrator password


  User creation failed. The password specified is incorrect or length of the user name is longer than supported
You should specify 

System username

System password

e.g. username and password one of the windows account