i've just read about how to remove the dual boot...my problem was the reverse of that..
i have the dual boot system...but an error occured on bootup...(ntldr is mising)
so i make a copy of that..but when i put it back,,, another error occured
(invalid boot.ini) and (hal.dll is missing)...
and what a big mistake i've done was i reinstall the win98...after reinstalling(w/o formating) it boot on win98,,the problem was the option for the dual boot did;t show on boot....i failed to find boot.ini in win98,,,i'd look the msdos.sys but...i don't know how to edit that...below are what on msdos.sys...

[option]
bootGUI=1
doublebuffer=1
autoscan=1
winver=4.10.10.2222
;
;the following lire are required for the compatibility with other programs.
do no remove them (msdos.sys need to be >1024 bytes).
;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxa
;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxb
;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxc
;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx up ....to s

[Paths]windir=c:\windows
winbootdir=c:\windows
hostwinbootdrv=c

anybody can help how to put back the option for dual boot..i'd look the d:drive (2nd partition where winxp was located) and it was on that...
i think the only problem was the boot.ini ...please help me.....thanks in advance