I'll have to wish you luck trying to find a participant. That OS was very poorly received, and it really doesn't give you any advantages over Windows 7. The only people I know of who still use it do so only because they can't afford to software upgrade to Windows 7.
"Glass Tiger for life!
is now open to entrants who are running Windows Vista online as their primary operating system. Simply make a post announcing your intention to compete, and remember to post here again when you switch to a different OS.