Turn off the guest account in Windows 7

If a guest account is not in use then you may turn off the guest account. Perform the following to turn off the guest account:
1. Click Start button , click Control Panel.
2. Click User Accounts and Family Safety if the View by: is Category and then click on User Accounts or click on User Accounts if the View by: is Small icons or Large icons.

3. Click Manage another account (If you are prompted for an administrator password or confirmation, type the password or provide confirmation).
4. Click Guest and then click on Turn off the guest account.

Now, the guest account is turned off.