Comment 5 for bug 8288

I had precisely this issue also on a friend's machine this evening; I followed
the useful guide at http://lwn.net/Articles/86835/. In short, it worked.

I tried all sorts of combinations in order to get both to go on. It didn't work,
I suffered the same symptoms: can't boot to W32, the W32 recovery commands
(FIXMBR, FIXBOOT, etc.) didn't help the situation, re-installing didn't do the
usual W32 of replacing the MBR/etc.

'sfdisk -d /dev/hda | sfdisk --no-reread -H255 /dev/hda --force' was basically
what worked for me - and yes, I did need the extra --force :(.

Apart from that, the detection of the W32 partition and the grub config was all
fine.