are you sure? it will be a hidden file.
If you dont have one, create it. Here is mine:
;Warning: Boot.ini is used on Windows XP and earlier operating systems.
;Warning: Use BCDEDIT.exe to modify Windows Vista boot options.
multi(0)disk(0)rdisk(1)partition(1)\WINDOWS="Microsoft Windows XP Professional" /FASTDETECT /NoExecute=OptIn
P.S. - rdisk is the hard disk number and partition is obviously the partition number. You may have to tweak those values to get it right on your system.