Boot.ini file missing on boot

When the PC boots you get an error indicating that the boot.ini is invalid and it is booting from c:\windows.

To fix create a boot.ini file with the following in it and save it to c:\windows

[boot loader] timeout=30 default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS [operating systems] multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect