How to Set a Startup Password to Lock or Unlock Windows
Press the Windows+R keys to open the Run dialog, type syskey, and click/tap on OK. If prompted by UAC, then click/tap on Yes
Click on Update as shown in Below fig
To Set a Startup Password
Select the Password Startup option, enter a password you want twice, and click on OK
Windows will now require users to enter the startup password at every system startup before Windows will start and users allowed to login to their user accounts
To Remove Startup Password
Select System Generated Password, select the Store Startup Key Locally option, and click on OK.
Enter the startup password and click on OK
click ok, Windows will now no longer require users to enter the startup password at every system startup.
for more articals visit http://computertechnologyspecial.blogspot.com