Follow the step as given:-

1.Open MSWORD.

2. Create you document as u wish.

3.Then save the file as shown

4. Before saving the file click on Tool given beside Save option

5. Then select General Option

6. Open the GENERAL OPTION.

7. At the place Password to Open,give your Password what u want and click OK.

8. Now normally save the file where u want.Your file is password protected.

9. Whenever u open the file it needs Password to open.