How to remove cached credentials

Create/edit this in registry, reboot and see if it works:


HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\Current Version\Winlogon\

ValueName: CachedLogonsCount
Data Type: REG_SZ
Value: 0

If you want to enable logon with cached credentials again, change it to a
number between 1 and 50 (10 is the default value). The number represents how
many users the computer will remember cached credentials for.