We have posted a detailed tutorial in past which shows you how to remove Branding logo from Windows 7 login screen:
If you want to customize the branding logo i.e. change the branding logo text, following utility will help you:
"Windows 7 Branding Changer" is an excellent, small and portable utility created by "myjuman" @ DA which allows you to change Windows 7 login screen's branding logo quickly and easily.

You just need to create a PNG file using an image editing software like Adobe Photoshop, Gimp, Paint.NET, etc, then select this PNG file using Load Picture button and at last Apply the image. It'll immediately change the text.
For your information, it modifies "Basebrd.dll" file present in "%windir%/branding/basebrd" folder and replaces the existing image with your desired one.
You can create the PNG image of 350x50 pixels.
It works perfect in 32 and 64-bit versions of Windows 7.
You can download it using following link:
Download Link
UPDATE: The developer has removed the software but you can check out following similar free tools to customize Windows 7 login screen:
Ultimate Collection of the Best Free Tools to Customize Windows 7 Login Screen
This article was posted by VG in following section: Software, Windows 7.
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Uewd
Thank you very much for this.
Someone
Thanks... Now it is really easy to adjust the version logo.
SMBR
Xcellent :=D
FailedAdmin
Hmm.. when i want to open it
It say's i have to install NET Frameworkv.4.0.5...
How do i install them???
VG
^^ Check following link:
http://www.askvg.com/what-is-microsoft-net-framework-download-links-for-all-versions-inside/
Johno
Anyone know how to change the larger logos (which it uses at higher DPI settings)? I'd use restorator but it won't except PNGs thus not being able to use transparency.
Thanks
Jyotishmoy deka
Netframework is the problem