what are the different of windows vista and windows xp?

There are some notable differences between Windows XP and Windows Vista. NetMeeting has been replaced by Windows Collaboration while MSN Explorer has been removed completely.

The "My" prefix on "My Computer", "My Document", etc. has also been dropped.

Windows Vista also no longer supports older motherboards technologies like EISA bus and advanced power management (APM).

Windows Vista 主要是介面靚左，Security 高左
但相對地硬件要求也高左。

這裡有講每個版本有何分別：
http://www.hkishop.com/Product/Operating_System/Microsoft_Windows_Vista_Home_Premium.aspx

the different of windows vista and windows xp
ANS:
VISTA:
要求高D(NEED FASTER HARDWARE TO SUPPORT)
"安全性"好D(THE USER CAN BE MORE SAFELY)
用戶介面靚D(GUI MORE BEATY)