With Media Center Studio I was able to change the Start Menu, text on the screen, add programs to MCE, and etc.
With Restorator 2007 I edited the all the images. This way was easier for me because MCE Studio reg editor didn't work for me. The file your looking for is ehres.dll. Its located in ''C:\Windows\ehome\''
This site help out a lot. If anyone needs my help, I will do my best.