In this demo i am set password in excle, word and power point without any software use in windows you can use this tricks from the create password protected files and secure the documents .
you can try to this definitely helpful from the secure your documents .
Step-1 : Open the word document of which you get the password
Step-2 : Click to file tab and click to the info option and again click the protect document button then you are showing to the list .
Step-3 : Now click the encrypt document dialog box then they are the asking to the password . you are the enter the password and click ok then they are the asking for the second time pasword and click the ok button
Step-4 : Now your file is password protected and the save the file and close this file and open again this file .