If you are using the classic logon screen, every time a user logs into your computer, their user name is stored, and that name is displayed the next time the classic logon screen is displayed. This can be a nice feature, but it also can be a feature that causes a security problem. Knowing a user's username is half the battle of breaking into a computer. If you have sensitive information on your computer, I suggest that you follow these instructions to hide the last user logged on:
1. Start up the Registry Editor again by clicking the Start Menu and selecting Run. Then type regedit in the box and click OK.
2. Navigate through HKEY_LOCAL_MACHINE, SOFTWARE, Microsoft, Windows, Current Version, policies, and system. Locate the dont display last username
entry.
3. Right-click the entry and select Modify. Then type in a 1 to activate the feature. Click OK, and you are finished.
If you ever want to reverse this hack, just repeat the instructions above and replace the 1 with a 0 for the value of dont display last username.
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