[ubuntu] 12.04 Can't boot into Ubuntu or XP

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http://ubuntuforums.org – I loaded 12.04 alongside XP on my computer. First experience with Ubuntu. I got Ubuntu to work, had some difficulty getting Grub to show up, but managed to get that fixed. From Grub, I selected my XP boot, and all I got was a black screen with blinking cursor. I rebooted, and now Grub is gone. Straight to the blinking cursor. I read somewhere else that "testdisk" was the way to fix this, but I can't boot into Ubuntu to try. I have the Install CD that the installer had me burn, but it just wants to partition again and install again. Closing out of that "install or try it out&q (Hardware)