How to Reset an Administrator Password on Windows
- 1). Click "Start."
- 2). Click "Control Panel."
- 3). Click "User Accounts."
- 4). Click the name of the administrative user account that you want to adjust.
- 5). Click "Change Your Password."
- 6). Enter your current password in the top box.
- 7). Enter the new password in the middle and bottom boxes.
- 8). Click "Change Password."
Source...