After updating Windows, password Admin required; Unable to work around

I have a Dell Optiplex 380 with XP - Pro on a closed network that is protected by a firewall and anti-virus protection.  After an update of Windows, I restarted the PC and suddenly requires an Admin password.  No password has already been defined on this PC and it was configured to open directly on the desktop.  I tried all the passwords I could think for our system without results.  I checked the BIOS which confirmed the password Admin/system "not defined".  I tried to start safe mode, but he also asked an Admin password.  I even pulled the jumper on the MB, but the connection is always necessary.  In addition, another PC in the system comes to a similar question which I have not yet tried to.  Is there anything else I could try before a reinstall?

Let me make it more clear.
It's a welcome screen...

or the classic logon screen...

?

If so you're only option here is to reinstall.

Tags: Windows

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