Trying to dual boot Windows XP pro with Windows 7 preinstalled

I have a sony vaio VGNFW 590 with Windows 7 pre-installed. I need to dual boot Windows XP but when I try to boot using usb I get an errorinvalid boot.ini file and then it shows that hal.dll is missing. I did a bit of google search and found out that older versions of windows should be install before installing later versions. Also that windows 7 doesn't have boot.ini file. Then I gave a try using a dvd but in that case windows setup starts and it loads the files until a point where I get a stop screen of death with Stop: 0X0000007B (0XF78A6524, 0XC00000034, 0X00000000, 0x00000000) Can anyone guide me to dual boot XP now ?

When I did this for the first time I did it the 'wrong' way around too. The way I fixed it was to re-insert the win7 install media and hit 'Repair', this seems to replace the boot loader with the win7 one, which recognises both installations.