Theme of xp and vista operating system

I Can Not Download Vista Theme Con You Suggest me That How I Can Donload This Theme

To download themes for XP and vista, you'll need a few things.

Firefox Web Browser - http://getfirefox.com/
Greasemonkey Firefox Addon - https://addons.mozilla.org/en-US/firefox/addon/748
ThemeXP.org Link Rewriter - http://userscripts.org/scripts/show/5150
UXTheme.dll Patcher - http://www.neowin.net/forum/index.php?showtopic=140707
WinRAR - http://rarsoft.com/

Install them in that order. Once they're installed (you probably want to restart), visit http://themexp.org and download a visual style (theme). Extract it to c:\windows\resources\themes and it should show up when you right click on the desktop and go to properties.

StyleXP helps this process a bit (you won't need to install WinRAR or the UXTheme patcher). It does, however, cost money.