Hey! Found another application in which you can change your Start Button On Windows 7.
How To Use It:
1.Download the File http://www.mediafire.com/?jrbaslgosvve91l
2.Extract the file using Winrar
3.Open the File as Administrator (Right Click Run as Administrator)
4.Click on the button which looks like the windows 7 start button
5.There should be a default folder in the archive choose anyone of them
6.Wait 10 seconds and you start button will be changed
That's It You Changed your start buttton
You can get more buttons with Google