Remove stored username and password

To remove the Stored User Names and Passwords from your system, try this:
Click Start, Run and type Control keymgr.dll
Remove the entries from the list.
The other ways to access this dialog are: 
Type Control Userpasswords2 in RUN box, click Advanced, Manage Passwords 
-or- 
From Control Panel, select your User Account, click Manage your network passwords

It Works

~ Cheers ~