Hard on folk today. You can google HOW TO INSTALL XP TO A SATA DRIVE to learn the usual methods but you find that most folk are wiped out and can't do any of the methods today since they don't have the right floppy drive or don't want to do the 5 week install method.
It could be as simple as a BIOS change but your post has no make or model noted so I was not able to see if the BIOS has support for XP.
I have a windows vista ultimate laptop.When I bought it it had Windows
xp on it.I upgraded it to windows vista then it started rebooting.So
when the computer shop people tried to put Windows xp the computer
didn't respond they said that it is beacause of the sata harddisk.After
somehow they put Windows xp.then my dad put windows vista again.Now it
works properly.but I want to put windows xp now should i do it?