To change the brand of your computer, follow these steps:
You want to find a file called "oeminfo.ini". You can do this by performing a Find File for "oeminfo.ini".
The file is in C:\WINDOWS\SYSTEM folder. Make a backup of this file and save a copy in a safe place.
If your computer doesn't have this file, you can create a new one. Just follow the example below.
Open the oeminfo.ini file by double-clicking on it. You'll see a list of items that looks something like this:

[general]
Manufacturer= TLab404 Speed Computer.
Model= TLabian

[support information]
Line1 = "Support Information Here"
Line2 = Call somebody other than us. Tech support is expensive!
Line3 = Seriously.
Line4 = We mean it!


You can change the information after the = sign.
If you're creating a new oeminfo.inf file, just follow this format. Line 1 creates the Support Information Here button, Lines 2-??? are the information displayed in the box that pops up.

Perform a Save As, and save the file as a .ini file (replace the oeminfo.ini file in the system folder).

Check the OEM info by right-clicking on My Computer and select Properties. Your changes should be in effect.
You can also add an image to the OEM info box. To do this:
Create a bitmap image with the dimensions of 175x100 pixels.
Save the file as a bitmap and name it "oemlogo.bmp".
Place the file in the system folder along with the oeminfo.ini.