Upgrade from Ubuntu 9.? to 10.4 messed up dual boot

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http://www.linuxquestions.org – I upgraded 64 bit Ubuntu to 10.4 two weeks ago. Prior to upgrade, I had dual boot to: XP - on sda1 (NTFS) and Ubuntu - on sda2 (ext3). After the upgrade, I could not boot into XP. I tried blindly running one of the "this will repair your grub" commands, but that probably made things slightly worse. There were some other problems too, so I decided on a fresh install from cd of 32-bit ubuntu 10.4. That is working nicely! Thanks Ubuntu team! But I still can't boot to XP. If I try, I just get a blinking curso (HowTos)