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Initially I had set up Slackware 13.37 and Windows 7 Home Premium dual boot. After upgrading to Windows 7 Ultimate, the dual-boot window does not show anymore so I cannot choose to boot Slackware.

Is there a way to fix this without deleting the Slackware partition and reinstalling?

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up vote 3 down vote accepted

You need to reinstall GRUB, you can do this from a chroot. Boot into a live CD, chroot into your Linux system and issue grub-install.

Something like the following should work (assuming /dev/sda2 is / and /dev/sda1 is /boot, and you want to install to the MBR on /dev/sda):

mount /dev/sda2 /mnt
mount /dev/sda1 /mnt/boot
mount -t proc none /mnt/proc
mount -o bind /dev /mnt/dev
mount -o bind /sys /mnt/sys
chroot /mnt /bin/bash
grub-install /dev/sda

Or if you're using LILO, use lilo /dev/sda instead.

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IIRC Slackware still uses LILO, so the way forward would be to call /sbin/lilo instead of grub-install. – Ulrich Schwarz Jan 30 '13 at 10:05
@UlrichSchwarz Not a Slackware user, so I wouldn't know. Updated with alternative, thanks! – Chris Down Jan 30 '13 at 10:15

No, you don't delete the linux partition.

The easiest way is setup grub4dos in your Windows 7 installation, or use an external media, do the chroot stuff, and restore the grub from your slack installation.

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The best way to get back your Linux distros is by simply using the Fedora DVD that you installed with previously.

It hardly takes 1 minute to reconfigure your bootloader.

Then you get your dual boot options with default selected as Linux.

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