Change "other user" logon picture

I am trying to use a Corporate logo on my Win 7 Enterprise build default picture instead of the flower

I can replace the user.bmp for the default user profile and that works fine in that each user that logs on get the company log displayed when the are logged on or lock their PC

but the issue is when the PC is booted there is a new user or "other user" - you still get a transparent blue background - is there a way to change this ?

Thanks Brink - I've seen that. I don't think other user is the issue. Its when the PC is first booted (or rebooted). Corporate GPO set to not remember the last username so you always have a first logon screen i.e. with no username remembered. The logo is transparent on a blue background. I have already replaced user.bmp in for the default user and this works fine but it is simply that transparent logo that displays at initial logon. I've looked at other threads but can't see anything - you can change the whole background but that's not the aim - just to "stamp" the corporate logo in the first logon picture