This is mostly caused by a system service that is using your account with an old password to log into your system.
System services (could be seen if you press WindowsKey+R, type Services.msc and press Enter) are typically using system accounts to log into Windows (services HAVE to be authenticated in order to start correctly.)
However, some applications that install their own services (an example could be a proxy application such as cntlm that uses its own cntlm Windows service to start automatically with Windows), could be configured to use your user account for logging. If you've changed your user account password recently, and there are services that haven't been reconfigured to use the new passwords, these services automatically log in into Windows when it starts.
These services continue to use your old user password. If your computer is part of a Windows Active Directory domain, you may have a GPO (group policy object) applied to your computer that limits attempt of your user account to log in into Windows (and hence into Active Directory) with an incorrect password.
Possible solution:
1. Open Services snap-in
2. Sort the table by Log On As column
3. Find out all the records that contain your user name.
4. Double-click the services with such a record and switch to log in tab.
5. Updater the password there, or, better, choose a system account such as Local System account.
Hope this helps.
Heck, could you look up System and Security logs?
Press WindowsKey+R, type eventvwr, then hit Enter.
Do you see any errors there?
Check out Unable to sign in to Windows 8.1.
- Proposed as answer by MeipoXuMicrosoft contingent staff, Moderator 23 hours 32 minutes ago
- Proposed as answer by MeipoXuMicrosoft contingent staff, Moderator Thursday, July 16, 2015 7:53 AM
Hi Ztilb,
I am glad the issue has been resolved and thanks for updating. It is very useful as a reference for the person who will come across the similar issue in the future.
Best regards