Ok I origionally had Win98 installed, I used partition magic to shrink the partition size, tested Windows it worked fine, Installed RH on the free space, using grub for the duel boot. when I get to the selection if I choose Red Hat it boots up fine, but if I choose Windows it starts to load then reboots. Now here is the kicker if I do it again I get the message that windows didn't boot properly last time and gives me the Normal, Safe Mode, etc options, if I go in under Safe Mode I can get in but I can't under any other options. so I'm not sure if it's a grub issue I've posted the grub.conf file here just in case. Now I think the line that says chainloader was added by a co-worker who was trying to fix it. Other than that it should be unaltered.


# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,1)
# kernel /vmlinuz-version ro root=/dev/hda3
# initrd /initrd-version.img
#boot=/dev/hda
default=0
timeout=10
splashimage=(hd0,1)/grub/splash.xpm.gz
title Red Hat Linux (2.4.20-6)
root (hd0,1)
kernel /vmlinuz-2.4.20-6 ro root=LABEL=/
initrd /initrd-2.4.20-6.img
title Windows 98
root (hd0,0)
makeactive
chainloader +1

i would say it would be corruption on the windows end...i don't think that grub is the problem....if you can boot into win98 at all (which in your case is only safe mode) then that means that grub must be configured correctly...is it possible to do a windows overlay?? if you don't know what i mean then, do you have the win98 cd or do you have the cabs already on your drive? if so boot into safe mode and just go to start--run--d:\setup.exe or start--run--c:\windows\options\cabs\setup.exe if the cabs were placed on the drive during installation....you may have it in c:\win98 instead, but in any case you should know the path if you know the cabs are on the drive....
and just to let you know this won't hurt a thing....everything on the drive will stay in tact, and nothing will be lost that you had installed or downloaded, so even if it doesn't work in the end, don't worry cause nothing was removed during this process...
the only thing that may happen is it may overwrite the MBR so you may have to re-install grub...