As you can tell from the title of this post the 360 version of Guitar Hero II controller works perfectly in Windows.  So you know what that means?  Plenty of extended play value via Guitar Hero II controller and Frets on Fire!  For those who do not know Frets on Fire is an open source game the is pretty much identical to Guitar Hero except that for the most part it is played on a keyboard, but can easily be changed to now work with the USB guitar.  The real bonus is that this game has an entire on-line community that helps to add new tracks, and it's fairly simple to add additional songs that neither Guitar Hero game may have.