Windows XP is better. Vista is a better at running games, but it is slower and more problematic than XP
windows Xp is better but Vista is slightly faster
There is no such thing as "Windows XP Vista." There is Windows XP and there is Windows Vista. They are two different versions of the Windows operating system (XP is older than Vista). As to which is better (XP or Vista) if that is your question -- I think most people would say that XP is better, but this probably depends on which operating system you are used to and what type of work you do with the computer. That said, even Windows Vista is out of date, now. New machines will have Windows 8 (or Windows 7 if it is slightly older).
Windows Xp Professional.
Windows Vista has numerous security improvements over XP, such as User Account Control (UAC).
No. Obviously, if you upgrade to Windows Vista, you will have Windows Vista.
There really is no benefit in using or having Windows Vista on your personal or business computer.
Drivers written for Windows Vista are not backwards-compatible with Windows XP. Most hardware that has a driver for Vista should also have a driver for Windows XP.
They are "compatible" in the sense that many applications that run on Windows XP will run on Windows Vista.
Yes ofcourse, Windows Vista is upgraded version of Windows XP. Obviously it can run Windows XP applications.
"Vista XP" is not a computer type. Vista and XP are both previous versions of the Windows operating system. The current version of Windows is Windows 8.1.
Windows Vista is notably far more secure than Windows XP.
No.