That's how old OS works..Even windows XP doesn't work like that..Windows 2000 does..
But here's how:
Use this method with your on responsibility.
1. If you have Windows 7 Professional or Ultimate, open the Group Policy Editor and navigate to the following policy.
Computer Configuration / Windows Settings / Security Settings / Local Policies / Security Options.
In the right-hand pane double click the policy:
Interactive logon: Do not display last user name - Change to Enabled.
2. If you have the Home Premium version, you can set this policy using the registry.
*Make sure you back up the Key before making any changes.*
Open Regedit and navigate to the following location.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
In the right side pane, look for the Value dontdisplaylastusername. Double click this value and change the Value Data to 1.
If this value is not present, right click and select New/DWORD (32-bit) Value.
Name the value dontdisplaylastusername and make the change noted above.
Here is a Screenshot of the Windows 7 login window.
http://i196.photobucket.com/albums/aa86/rvmv/ManualLogOn.jpg
I don't know if it gonna work on windows 10 but I'm positive
😀
Hope this helps!