Here is the way of ur choice dear i think that will be helpfull for u...
Go to start > Run and type Regedit to open the registry editor. Look for this path:
In the right, find the "Shell" entry. Double click on it and replace explorer.exe with softpedia.exe (or whatever you renamed the edited file).
Close the registry editor and Log Off or Restart your computer. After Windows XP boots, the new start button will have the name you have chosen.
My tip is not to use long names because the start button will have to adapt in order to be able to show such names and its shape will be elongated and might not look too pleasant.
if it work then reply me .....