Make a new pc with windows xp + i5 processor

use windows 7.

i5 3570k if you are overclocking
i5 3470 if you are not

asrock h77m motherboard if you are not overclocking
asus z77-v LK or z77-v pro if you are overclocking.

the motherboard choice totally depends on your budget and needs

i have one more option for windows xp

plz..suggest

1-which amd processor

2-which asus motherbord

i dont see the point of xp. i wont suggest amd processors at the moment. they are all mediocre

Why would you use XP? Its a completely obsolete OS. Nobody uses XP and no developers makes any more software for it. All of them are towards Windows 7 and 8.

Besides building a new PC with XP is a terrible choice. You can't use more than 4gb of ram since XP limits it.

Two questions:

1: Why go for XP?
2: Why only ASUS?

There may be some software that requires XP, but very little. There are also other good motherboards out there besides ASUS; Gigabyte and ASRock come to mind.

there is always windws 7 pro which has xp mode

XP security support expires pretty soon, so you really need to go to 7 or later.