How to log in as admin on the user's machine without leaving any traces in the login field?

Question

System administration

Hello.
Not so long ago, one plant began to enikeit on the sly.
Admin about fifty computers, due to the peculiarities of the company we do not use VNC / RDP / etc ... (do not ask why), so admin operations have to be performed directly on the user's machine, and some operations directly from admin accounts, logging out of the system under user. I don’t know the passwords of all users, and physically I can’t remember, the user is not always there to ask me to enter my pass after I do all the necessary things.
The crux of the problem: the Windows XP login screen remembers the name of the last user, ie admin, upon returning to the workplace, some users stubbornly break into the admin with their password, while blocking the account on the DC.
Question:somehow it is possible to avoid "remembering" the admin login, or otherwise get out of the situation?
ps I apologize in advance for my tongue-tied language.

Answer 1

Local Policies -> Security Options -> Interactive Logon: Do not display last username

Answer 2

if we consider only running the program under the administrator from under the current account? or (if specifics allow) remote connection to the console ..
on old machines with windows xp I use
runas /user:DOMAIN\Administrator

Answer 3

Hide the admin altogether (only double CTRL+ALT+DEL will display it in XP):

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList]
"USERNAME"=dword:00000000

In the case of Windows 7, to run / install something from the admin, you need to hold down Shift and press RMB, and then select "Other user" and enter a username / password pair.

Answer 4

for Windows XP
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\DefaultUserName
for Windows 7
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI

Answer 5

Even in XP, right-clicking while holding shift gives you the "Run as" option.
From your seat, you can use dameware remote supprot to get a remote console.
If you want to install something, then you can either scatter policies through AD, or MS system config manager, which is the most correct.