Try right-clicking on My Computer, going to Properties, then Advanced>Startup and Recovery...>UNcheck "Display list..." and select your default OS.
Otherwise, try deleting the line with win98 in it in your boot.ini. Refer to
this article
If it helps any, myne (2k installed on c: - only partition/physical drive):
[boot loader]
timeout=15
default=multi(0)disk(0)rdisk(0)partition(1)\WINNT
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINNT="Microsoft Windows 2000 Professional" /fastdetect
~Ladi