I know most of you build your own computers or build for friends/family/clients. Here's an easy way to add custom OEM information. I was looking for an app to do this with Windows 8 and ran across this app that also works with 7/Vista/XP.
Here's an example of what I added.
Here's a direct link to the download if you hare having trouble grabbing the file. I compressed it with 7-Zip so you will need to extract the file. From there run the executable.