I do stage 2 of installation, then, when grub is m...

I do stage 2 of installation, then, when grub is merging (after downloading), it says to me:

!!!Cannot write to '/boot'
!!!Please check permissions and directories for broken symlinks.
!!!You may start the merge process again by using ebuild:
!!!ebuild /usr/portage/sys-apps/grub/grub-0.92-r1.ebuild merge
!!!And finish by running this:env-update

I know nothing about what to do.
Maybe the thing is that i have winxp (hda1 - os, hda2 - different data). With fdisk i'we made hda6 - boot, hda7 - swap, hda8 - for system and i'we pointed hda6 as bootable with the help of 'a' command of fdisk.

Help me!!!