lol, like i said, it's quite simple, all you have to do is
1. Get a 180 x 115 .bmp image
2. navigate to WINDOWS/System32
3. Find the files OEMLOGO.bmp and oeminfo.ini
4. Backup the files
5. Replace them with your own
6. (to change the displayed text, just open up the oeminfo.ini, from there it's pretty straight forward).
that's pretty much it, just make sure to have your new files the exact name of the old ones, if you have any questions, simply post your problem and i will try to help you, have fun branding.
by the way, after you do it, post a screen shot, i wanna see how they turned out.
3.2 Ghz PD Processor, 2 GB of (667 Mhz) RAM, 10,000 RPM HD,
ASUS GeForce 7950 GX2 (1 GB of onboard video memory)