Admin password change

FranzB

Account closed by request
OS: W7 Home
There are two user accounts: an admin account with password and a std account
with password.

The following happened when i changed the password of the admin account.
I gave in the old password, then the new one.
When i clicked on a program to run it with admin rights i logged in with the new password and, as expected, the program could be started. So far so good.

However, after restarting the computer and trying to log in to the admin account the new password was not accepted but neither was the old password!!
I then logged in via the std account and did a system restore. When asked for the admin password i used the new password which was accepted. After the sytem restore the old password was valid again and was accepted when i logged in to the admin account on the welcome page.
I am compltetely at a loss. Could it be that all this is due to the user account control being set at "always notify"? Somehow i doubt it but what could be the cause that no password was accepted any longer by the admin account on the welcome page wheras the new password was accepted anywhere else once logged in via the std account?
Thanks for any suggestions.
 

My Computer

Computer Manufacturer/Model Number
Acer Extensa 5235
OS
Windows 7 Home Premium 32bit, Linux Mint Julia, in dual boot mode
CPU
Intel Celeron 900 @2.2 GHz
Motherboard
Acer BA50-MV(U2E1)
Memory
DDR3 2048 Mbytes
Sound Card
Conexant HD Audio
You sure you put in the right password?
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Alienware Aurora ALX R4
OS
Windows 10 Pro (x64)
CPU
Intel Core i7-3930K (3.2GHz - 4.5GHz)
Motherboard
Alienware Aurora-R4 x79
Memory
4x Samsung 4GB PC3-12800 DDR3 (16GB 1600MHz)
Graphics Card(s)
Nvidia Geforce GTX 690
Sound Card
SteelSeries Siberia Elite
Monitor(s) Displays
Dell UltraSharp U3011
Screen Resolution
2560x1600
Hard Drives
Samsung 850 Pro 256 GB, Seagate 1TB Desktop Hybrid HDD, 2x Western Digital 4TB Green HDD
PSU
875W Some Dell PSU <.<
Case
Alienware Aurora ALX
Cooling
Custom Liquid Cooling (EK CPU & GPU blocks) dual EK 480RAD
Keyboard
Logitech G710+ Mechanical
Mouse
Logitech G700s
Internet Speed
Verizon Fios (50 mbps average)
Other Info
Server: Intel NUC D54250WYK: i5-4250U, 16GB, 256 GB mSATA, Windows Server 2012 R2
You sure you put in the right password?

Definitely. I even repeated the procedure after the sysytem retore. Same result:
the new password was not accepted for logging in on the welcome page.
Besides, once logged in via the std account the new password was accepted when
i had to give it to run a program under admin rights. That's what really bugs me.
Accepted in one place but not in another.
 

My Computer

Computer Manufacturer/Model Number
Acer Extensa 5235
OS
Windows 7 Home Premium 32bit, Linux Mint Julia, in dual boot mode
CPU
Intel Celeron 900 @2.2 GHz
Motherboard
Acer BA50-MV(U2E1)
Memory
DDR3 2048 Mbytes
Sound Card
Conexant HD Audio
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