??? hi recently i changed my OS to xp from vista but i don't like xp theme and want theme or looks like vista so if you have any knowledge regarding this issue please post your views.

That is easy actually.
First goto Personalize and select windows Classic theme and also you can customize how start menu look by altering properties of start MENU, can do via right click on "Start" button and then goto its properties.

you didn't read it properly ricky bro i said i am using xp and i want to change my xp theme to vista home basic theme.