How to delete saved passwords

Hopefully for the end user (not for all administrators) which have difficulties to remember all his passwords there's a functionality in some applications that allow to save them:

Unfortunately when the user change the password in Windows 7 it's a nightmare to found the window handling them.

There's a command line to directly open the window and "save" the user who wants to access to an important data for a meeting. In a PowerShell run the following command line:

 rundll32.exe keymgr.dll, KRShowKeyMgr

The rest is easy: deleting the account :)

Thanks to Romain to point out the problem and for the solution.