When you log in to a server remotely and you save credentials on a windows box the information is saved in a vaults.
Windows Vault storage location
Windows 7 stores the Windows Vault files in
C:\Users\[UserName]\AppData\Roaming\Microsoft\Credentials if the computer is an Active Directory domain member, and in
C:\Users\[UserName]\AppData\Local\Microsoft\Credentials. If you want to get rid of all your stored credentials you can simply delete the encrypted files in these locations.
Getting the information is very easy once the users has access to the computer in question.
"Cain & Abel can restore passwords from the Windows protected storage, the Credential Manager, standard edit boxes, LSA secrets, SQL Enterprise Manager, Windows Mail, dialup, Remote Desktop profiles, and the Windows wireless configuration service."
Also the if the user has access to the box they will be able to use a pass the hash to move thought out the network.
If the PC is Windows XP see below, if not the below solution may work:
Try re-starting the Laptop in Safe Mode. To do this turn the Laptop on and continuously press F8 until a menu is displayed. When the menu is displayed, click on Safe Mode (without networking). When the welcome screen comes on, click on Administrator, then go to control panel, user accounts and you will have to delete the account. But at least you got into the Laptop. If you don't use the welcome screen, at the log in screen put the username as "Administrator" and password blank. This usually works.
Also if the laptop is win 7
Now the video and the link about hacking XP and WIN7 are removing the admin password this does not REMOVE the other Credential uses to connect to a network.
Hope this helps.
I have not tested the link to see fi they work on win 7 or XP.
And lastly ,
"Q: What is the Registry location that Windows XP stores the wireless key ?
A: The wireless keys are stored in the Registry under
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WZCSVC\Parameters\Interfaces\[Interface Guid]. The [Interface Guid] is a unique GUID value the represents your wireless network card. The keys are well-encrypted by Windows operating system, so you cannot watch them with RegEdit."