You need to remove the option you don't from the BOOT.INI file.
For example, you would delete the second option below:
[operating systems]
multi(0)disk(1)rdisk(0)partition(1)\WINDOWS="Windows XP Professional" /fastdetect
multi(0)disk(0)rdisk(0)partition(2)\WINNT="Windows 2000 Professional" /fastdetect
Here's a link how to edit the BOOT.INI: http://support.microsoft.com/?kbid=289022
For example, you would delete the second option below:
[operating systems]
multi(0)disk(1)rdisk(0)partition(1)\WINDOWS="Windows XP Professional" /fastdetect
multi(0)disk(0)rdisk(0)partition(2)\WINNT="Windows 2000 Professional" /fastdetect
Here's a link how to edit the BOOT.INI: http://support.microsoft.com/?kbid=289022