Finally i use Windows XP PRO SP3. You can download it here

If you want to feel Vista style but low resource use, consider install this Win XP SP3.
Problem?
People keep talking about disadvantage of Win XP SP3. For me i just installed it and i want to try it and see what happen. So far i notice that it was not compatible with Adobe Photoshop CS 3. That was my first debug. Stay tune i will post update here, what application may incompatible with this OS.
You comment are appreciated.
*Update*
For them use Bux.tu auto clicker, this program will not work in Win Xp SP3
Stay tune more update to come.
Aware or not Microsoft has release Service Pack 3. Since release of service pack 2, Microsoft produce thousand updates or patches. Now in Service pack 3 all those patches and updates are include/bundled.
Supported Operating Systems: Windows XP; Windows XP Home Edition ; Windows XP Home Edition N; Windows XP Media Center Edition; Windows XP Professional Edition ; Windows XP Professional N; Windows XP Service Pack 1; Windows XP Service Pack 2; Windows XP Starter Edition; Windows XP Tablet PC Edition
My Advice
Before using this program always do the following:
Update:
This issue was posted on this forum and following is the what member response.
We have experience with both XP & Vista and there is not even a question - Vista is a HUGE disappointment Memory hog if there ever was one and every user we know has had the same experience Any knowledgeable systems/network pro recommends NOT upgrading This is not a cost issue - pretty ridiculous to state that must be people’s concern Even Steve Ballmer has said he is open to extending the time frame Dell has even made the decision to sell you the Vista as they will have to follow MS’s guidance but provide the buyer a downgrade to XP That way if they ever get Vista right the buyer can choose to upgradeat no cost
You may take participate discussion here