How to Disable Auto Logon in Windows XP

To enhance security and prevent Windows XP from automatically logging on:

Click on the Start Button, select Run, and type rundll32 netplwiz.dll,ClearAutoLogon

No confirmation will be displayed, but when you restart the machine the Welcome Screen with a login prompt will appear.  (A plain login box could also appear, depending on your system settings.)


There are two other working methods to stop the auto logon, at the link below.

Thanks to Ramesh for detailing several methods to stop the auto logon in Windows XP 

Why I shared this tip:
Last night I setup a Windows XP virtual machine in Parallels (on a mac).  This was on a shared computer and so I needed to prevent the others users from having immediate access to Windows XP until they were given access.