Password protect documents, workbooks, and presentations

Please follow the Microsoft link below:

Password protect documents, workbooks, and presentations

How to Lock and Hide Folders in Windows Without Additional Software?

Follow these steps:
1) Open Notepad and copy the contents of the code below.

cls
@ECHO OFF
title Folder Locker
if EXIST "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}" goto UNLOCK
if NOT EXIST Locker goto MDLOCKER
:CONFIRM
echo Are you sure u want to Lock the folder(Y/N)
set/p "cho=>"
if %cho%==Y goto LOCK
if %cho%==y goto LOCK
if %cho%==n goto END
if %cho%==N goto END
echo Invalid choice.
goto CONFIRM
:LOCK
ren Locker "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"
attrib +h +s "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"
echo Folder locked
goto End
:UNLOCK
echo Enter password to Unlock folder
set/p "pass=>"
if NOT %pass%==type your password here goto FAIL
attrib -h -s "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"
ren "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}" Locker
echo Folder Unlocked successfully
goto End
:FAIL
echo Invalid password
goto end
:MDLOCKER
md Locker
echo Locker created successfully
goto End
:End

2) Change the password by replacing ‘type your password here‘ in the code with your password.
3) Save it as XYZ.bat (Note: Try to be innovative and save it in such a way that it sounds like a system file so that nobody will try to bother clicking it)
4) Close the file if it is still opened and double click XYZ.bat
5) It will create a new folder called ‘Locker’ automatically. (If you want the file name to be different, find and replace Locker in the code with the name of your choice). This new locker folder will be created in the same hierarchy as the .bat file.
6) Place the contents inside and double click XYZ.bat, it will ask whether you want to lock. Say ‘Y’ and now your folder will disappear.
7) To view again, double click XYZ.bat again and enter your password.
Frequently asked questions:
1. What if I no longer want to hide the folder?
Just delete the XYZ.bat file when the locker folder is in visible mode. Or you can rename the Locker folder to something else and the next time if you double click, it will create an empty Locker folder.
2. What if I deleted the .bat file when the Locker folder is not hidden?
You can download the code again, change the password and create the XYZ.bat file. Now paste that file in the same hierarchy as the Locker folder. It will work as before with the new password.
3. What if I deleted the .bat file when the Locker folder is hidden?
The contents are still there hidden, so don’t panic! Just download the code again, change the password and create the XYZ.bat file. Now paste that file in the same hierarchy as the Locker folder is hidden. Double click the .bat file and you can unlock the Locker folder with the new password.
Note: This trick is only to provide Privacy, so that nobody accidentally opens your private folders. It does not provide any ultimate security. Anybody can open XYZ.bat in any text editor and view the code. As I had mentioned it before try to keep this file in not an obvious place with a name that looks like a system file, so that nobody will have a chance to touch or doubt at this file.

Protect files from being deleted

1. To test this create a test.txt file on you desktop.
2. Now, to protect this file, right-click the file and choose Properties.
   
3. On the Security tab, click Advanced.  The 'Advanced Security Settings for test.txt dialog options.
   
4. Click the Change Permissions... button.
   
5. Click the Add... button, and type "everyone" (no quotes) into the box, then click OK.  A 'Permission Entry' dialog appears.
   
6. Scroll to the bottom.  Place a checkmark in the 'Deny' column for "Delete".  Do not add any other checkmarks.
   
7. Turn on (checkmark) the option at the bottom called 'Apply these permissions to objects and/or containers within this container only', then click OK.
   
8. Turn on (checkmark) the option at the bottom called 'Replace all child object permissions with inheritable permissions from this object', then click OK.
   
9. All done. Your file is now password protected. No one, not even you (the creator) can delete this file, on purpose or by accident.
10. Remember, the same thing applies for a folder.
11. Windows will set the deny permission on every file and subfolder under this folder, unless you have set up one to not inherit permissions from its parent (you probably haven't done that). 

Note: Deny permissions take precedence over allow permissions, so no one will be able to delete any file until/unless this permission item is removed.  This will block other apps from being able to delete either (for example, the Photo Gallery or Media Center).

A special thanks to Shawn B Keene [MVP] for the above information.