dealing with user password credential manager

i .   login with the current user account.

ii.   Click Start and type run in the search and hit Enter .

iii.    type "control userpasswords2 " in the run window and hit Enter

iv.    check if the check box which says Users must enter a user name and password to use is checked. If the check box is checked then uncheck the check box, click on apply and ok tab and hit enter.

v.    Restart the system.

vi.    You will be able to see different users in the logon screen.

 delete stored passwords from your machine..(win 7)

     click Manage Password

if you are not sure which application is using your credential please feel free to remove it. :)