Add Password to folder

For this firstly you have to make your folder zip..
for this
right click on folder--> send to--> compressed(zipped) folder...

If the Folder is Zipped you can give it a unique password.

Just double-click the zipped folder. In the top menu select File then
click "Add a Password".

Type a password into the Password box. Then again in the "Confirm
Password" box.

Now, you are the only person who can access files in this folder. The
folder can be opened allowing the files to be seen, but you are the only
one who can access them.