You talk about the winlogon.exe, right? This exe is responsible for login and registering Ctrl+Alt+Del, for example. It also loads the msgina.dll which manages your login process. If you only want to change logon dialog or bitmap, this is what you want. Open the msgina.dll as resource, e.g. with ResHacker, and play around. But be **** careful! Don´t f*** the thing up. Better make backups, try it out on VirtualPC or have sth. like ERD Commander next to you Otherwise you may not be able to login to your windows, yes i know what i am talking about . But if you really want to change login process, e.g. loggin in with fingerprints or sth. you better make yourself familiar with C++ and search the MSDN für GINA. I played around a little bit with gina programming, but it is really a pain, because i couldn´t debug the thing, and always had to reboot, when i did changes... so keep it up.