On the Windows 2000 CD-ROM, there's a directory, VALUEADD3RDPARTYCA_ANTIV, that can be recycled to make a DOS boot...
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From inside the folder, click on START (make sure you have a floppy in the a: drive) and type "makedisk" in the dialog box.
When the disk finishes creating, delete the autoexec.bat file on the floppy, and all of the files except for the following:
Add those files that you need and boot the with the disk to enter DOS mode. Should be enough room to get a BIOS on it.