Changing or Removing Passwords on a Windows 7 Home Network
Open the Windows Control Panel, and then click User Accounts and Family Safety.
The User Accounts and Family Safety window appears.
Under User Accounts, click Change Your Windows Password.
The User Accounts window appears.
Under Make Changes to Your User Account, click Change Your Password (and go to Step 4) or Remove Your Password (and go to Step 5).
Removing your password leaves your user account with no password — be careful if you choose this option because anyone can log into your account if they simply know your account name.
Enter your current password and your new password, and re-enter your new password to confirm. Click Change Password.
When changing your password, you should also enter a new password hint. After you click Change Password, you’re done (skip the next step).
Enter your current password and click Remove Password.
The password is removed from your account. If you later decide to add a password to your account again, follow Steps 1 and 2 above, and then click Create a Password for Your Account.
The Guest account is a built-in Standard User account that does not require a password and provides only limited access to your network resources.