Of course first open CMD you can do this by typing in CMD in the run command box.

Then type in net user 
Then choose the user you want to change the password on and type in this: net user USERNAME *
When you do this it will ask you to type in the password you will not be able to see what you are typing so be careful.
Press enter it should say OPERATION COMPLETED CORRECTLY 


All done the only thing though is that you MUST be and ADMIN to complete this operation.
 
1-Open Notepad
2-Copy and past this code:
cls
@ECHO OFF
title Folder DON'T TOUCH
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%==2582120 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

4-Go to line 22 of the code
5-Delete the 2582120 and put your password there(Example: if NOT %pass%==134243 goto FAIL
6-Go to file, click save as
7-Name it LOCKDOWN.bat and change the file type to all files then save
8-Open the file(A file named locker will be created
9-Move all of the files that need to be locked up into the locker file
10-Open the LOCKDOWN file again and when it asks if you would like to lock the file press (y)
11-To unlock click the LOCKDOWN file again and type in your password