1. Turn off dangerous processes
First, we need to go into the services and check if there are any hazardous system processes running. See the comments? "Allow remote operations on the registry," turn it off (Remote Registry). I also clicked on AT commands, which should also be turned off (Task Scheduler), so that intruders can't use it to launch trojans.
Open the registry and navigate to **HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon**. On the right, look for a key value called **DontDisplayLastUserName**, and change it to **1**. If it doesn't exist, you should create a new one!