Why does my Windows XP/Ubuntu dual boot not let me select an operating system?

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http://askubuntu.com – I recently installed a second hard drive on a Windows XP computer. I installed Ubuntu 12.04 from DVD-ROM onto the second drive, using the installer to partition. When I start the computer, I do not get the option to choose the operating system, and Windows shows the drive (F:) as not having any Linux files. What is my next step? (HowTos)