multi-boot cfdisk warning: is it broke? How do I fix?

I tried to set up a dual boot of windows and linux from
the installer. The linux part works, but windows 7 starts to boot
and then takes me back to grub.

I am sufficiently happy with linux that I was planning to get
rid of windows. I would like to use the space to give openBSD a
try.

As a first step, I tried using cfdisk -Ps /dev/sda, and got the
ominous warning:

FATAL ERROR: Bad primary partition 2: Partition ends in the final partial cylinder

Since linux is working, I'm worried that trying to fix whatever this
problem is might wreck my system.

fdisk -l /dev/sda gives:

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xbb0c5abb

Device Boot Start End Blocks Id System
/dev/sda1 1 192 1536000 27 Unknown
/dev/sda2 192 12349 97656250 7 HPFS/NTFS
/dev/sda3 37264 38914 13248512 17 Hidden HPFS/NTFS
/dev/sda4 12350 37264 200128513 5 Extended
/dev/sda5 * 12350 12392 340992 83 Linux
/dev/sda6 12392 13486 8787968 83 Linux
/dev/sda7 13486 13851 2928640 83 Linux
/dev/sda8 13851 14826 7827456 82 Linux swap / Solaris
/dev/sda9 14826 14874 389120 83 Linux
/dev/sda10 14874 37264 179849216 83 Linux

Partition table entries are not in disk order

************** copy of my grub.cfg file *******************

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry save_env prev_saved_entry
set boot_once=true
fi

function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}

function load_video {
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
}

insmod part_msdos
insmod ext2
set root='(hd0,msdos6)'
search --no-floppy --fs-uuid --set a5ae78d6-949a-4462-bc98-6c53a846c401
if loadfont /share/grub/unicode.pf2 ; then
set gfxmoded0x480
load_video
insmod gfxterm
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='(hd0,msdos5)'
search --no-floppy --fs-uuid --set d487742e-ad50-4347-8d9a-b8d0f1908c13
set locale_dir=($root)/boot/grub/locale
set lang=en
insmod gettext
set timeout=5
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
insmod part_msdos
insmod ext2
set root='(hd0,msdos6)'
search --no-floppy --fs-uuid --set a5ae78d6-949a-4462-bc98-6c53a846c401
insmod png
if background_image /share/images/desktop-base/spacefun-grub.png; then
set color_normal=light-gray/black
set color_highlight=white/black
else
set menu_color_normal=cyan/blue
set menu_color_highlight=white/blue
fi
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-amd64' --class debian --class gnu-linux --class gnu --class os {
insmod part_msdos
insmod ext2
set root='(hd0,msdos5)'
search --no-floppy --fs-uuid --set d487742e-ad50-4347-8d9a-b8d0f1908c13
echo 'Loading Linux 2.6.32-5-amd64 ...'
linux /boot/vmlinuz-2.6.32-5-amd64 root=UUID=d487742e-ad50-4347-8d9a-b8d0f1908c13 ro quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-2.6.32-5-amd64
}
menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os {
insmod part_msdos
insmod ext2
set root='(hd0,msdos5)'
search --no-floppy --fs-uuid --set d487742e-ad50-4347-8d9a-b8d0f1908c13
echo 'Loading Linux 2.6.32-5-amd64 ...'
linux /boot/vmlinuz-2.6.32-5-amd64 root=UUID=d487742e-ad50-4347-8d9a-b8d0f1908c13 ro single
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-2.6.32-5-amd64
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows 7 (loader) (on /dev/sda1)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set 6eb0817ab0814a13
chainloader +1
}
menuentry "Windows 7 (loader) (on /dev/sda2)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos2)'
search --no-floppy --fs-uuid --set b8f4a8c3f4a884ea
chainloader +1
}
menuentry "Windows Recovery Environment (loader) (on /dev/sda3)" {
insmod part_msdos
insmod ntfs
set root='(hd0,msdos3)'
search --no-floppy --fs-uuid --set 7816d0b116d0721c
drivemap -s (hd0) ${root}
chainloader +1
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###


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