How to remove PowerPoint Password

PowerPoint is a presentation software program that is part of the Microsoft Office package. PowerPoint uses a graphical approach to presentations in the form of slide shows that accompany the oral delivery of the topic. This program is widely used in business and classrooms and is an effective tool when used for training purposes.
As a high school teacher, I often use it to prepare my lessons. For some reason, I added password on it because I want to attend in scientific activities, but unlucky, finally I am too nervous to remember my death password.
How to remove PowerPoint password? Can anyone help me fix this problem?
I had used very strong password, oh my God!

PowerPoint Password Recovery 5.0 is an easy-to-use tool designed for recovering the lost or forgotten MS PowerPoint presentations password. Passwords-to-modify are recovered in just seconds! For passwords-to-open, PowerPoint Password Recovery 5.0 offers three different searching methods: advanced dictionary attack, brute-force attack, and advanced brute-force with mask attack.. MS PowerPoint versions 2002 to 2007 are supported.
MS PowerPoint versions 2002 to 2007 are supported.
Instantly recover all other types of PowerPoint passwords.
Include a wizard for easy setup of password recovery attacks.
Tips: Here is a concise user guide for you to quickly get familiar with PowerPoint Password Recovery. Any inquiries about using the program, please refer to the “Help” document integrated in the program.
Step 1: Click “Open” to import the target PowerPoint file to the program.

Select your file in the Open File window and click “Open”.

Step 2: On the “Recovery” tab, select “Brute-force Attack (Trying All Possible Combinations)”.

Step 3: Click “Start” button in the Menu to initiate the program.

Step 4: Some time later, a message box pops up to you, showing the User Password expected. Click “Remove All Passwords from the File” to remove all the restrictions placed on the PPT file. Click “OK”.

If you remember your password, then use this method easy to remove your password.
1. Open the document.
2. Enter the password (password: A sequence of characters needed to access computer systems, files, and Internet services. Strong passwords combine uppercase and lowercase letters, numbers, and symbols.) When prompted.
3. On the Tools menu, click Options, and click the Security tab.
4. In the Password to open box or the Password to modify box, select the placeholder symbols (usually asterisks) that represent the existing password.
5. Do one of the following:
* To remove the password, press DELETE, and then click OK.
* To change the password, type the new password, and then click OK.

If you changed the password, reenter the new password, and then click OK.