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If your computer is running OEM version of Windows, you probably can see that ugly D(H)ell, HP (or whatever your computer manufacturer is) logo in your System Properties window.
I will show you how to get rid off it or change it to something else.

Let's get started. If you just want to remove it, all you have to do is delete x:\WINDOWS\system32\oemlogo.bmp (the logo) and x:\WINDOWS\system32\oeminfo.ini (computer make, model, manufacturer contacts, etc...). After this you should end up with something boring like this:

Now, if you build/rebuild computers and want to put your own logo or just want to personalize your computer more. You can add your own logo and information.
The Logo:
Image you use for your logo shouldn't exceed 180px by 115px and has to be 256 color BMP. Name it "oemlogo.bmp" and put/replace it into your system32 directory.
Model and Other info:
Model and make information is stored inside "oeminfo.ini (inside system32 directory)".
[General]
Manufacturer=Computer make
Model=Computer Model
[Support Information] Optional. Everything after this line will show up after you press "Support Information" button.
Line1=whatever (number of lines is limited to 64 KB)
Line2=whatever
Line3=whatever
Example:
Let's say our logo is:

And oeminfo.ini:
[General]
Manufacturer=Windows XP Pirate Edition
Model=Arghhh 3200
[Support Information]
Line1=Contacts:
Line2=
Line3=zygzag@zygzag.org
The outcome:

That's it!
I'm in no way responsible if something goes wrong. You should make a back up.