Hiding the Last User Logged On

well, sometimes this could really disturbing and you maybe don't wanna know when you go to the victim computer and log in and you wanna make it hidden.

well,so you can try this method

If you use the standard NT style of login and want to hide the last user:

1. Start the Group Policy Editor (gpedit.msc)
2. Go to Computer Configuration / Windows Settings / Security Settings / Local Policies / Security Options
3. Scroll down to Interactive logon: Do not display last user name
4. Set it to Enable