No password/user box/LogonUI prompt after ctrl-alt-del hit
It’s your friendly Windows helpdesk guy here.
We have an issue that seems random, where certain users fail to get the password prompt after hitting ctrl-alt-del combo at logon (LogonUI).
The culprits seem to be the combo of HP Z620 workstations + Matrox video card “drivers” or, simply, Matrox PowerDesk software.
I opened a case with Microsoft support due to the fact that I could not use xbootmgr to troubleshoot the issue, I did not understand where else to go.
They advised me to clear any Credential Provider other than the following list:
GenericProvider NPProvider VaultCredProvider PasswordProvider Smartcard Credential Provider Smartcard Pin Provider WinBio Credential Provider CertCredProvider
This includes the stupidly risky Credential Provider “Matrox.Pdesk.LogonRelocator64”.
I guess Matrox is trying to be helpful by creating a credential provider to move your LogonUI screen around; it’s quite clear that the cost of messing with Credential Providers to provide such a trivial benefit is too high.
Delete the above registry key to avoid the problem.