To change your computer password follow these steps (the proccess is the same for Windows Vista and XP):
- Go to the Control Panel. You can access the Control Panel through the Start Menu.
- Open up User Accounts.
- Select Change your password.
- You will need to put in your old password as well as your new password to change it.
- Click Change Password and your done.
For information on changing your SureDesk™ password see here.