Every application that ships with Windows Vista starts with “Windows” like Windows Photo Gallery and so on (except for the old ones like Paint or Notepad). If you open enough of them, the taskbar shows a lot of “Windows…” titles. I have counted 10 applications that starts with that word. (Interesting: On Mac OS X Microsoft Office Word only says “Word” to the user at the menu bar).
If that works on Mac OS X why not on Vista? Hide the term "Windows" on the taskbar buttons or rename the new applications. There is nothing wrong with simple names like "Paint" or "Notepad".