Click Start >> Run then type cmd
type the following: net user /add
then type the following: net localgroup administrators test /add
log off and choose the new account "test" and open it
Click Start >> Run then type compmgmt.msc
In the dialog box, choose from the left list "Local Users and Groups" and you wil see on the right files, double click on Users
Right click on the account that you want to modify its password and click on Set Password
...
You will see a warning, click Proceed
Now type the new password and retype it to confirm and click OK
Close the Computr Managemen dialog box and try logging to the account that you changed its password
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Note: When you type the commands do not formget the spaces and the type of the slash
Also you can delete the new account test after modifing the password
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Warning: I DO NOT take the responsibility of unauthorizd usage of this
اسهل طريقة لتغيير كلمة الادمن السرية 
