DVD drive in boot selection list but not booting?

I bought a second-hand Lenovo T400 which has newly-installed windows XP OS. I want to change my OS to Windows 8.

I inserted a windows 8 installation dvd.

I tried setting up DVDRamSomething as first in boot priority, but it starts up in WinXP. Next, I tried manually selecting DVDRamSomething as temporary boot device, but it also starts up in WinXP. I don't know any possible problem.

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Click on my name need more information and can walk you through it face too face on Google hangouts thanks.

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ianmccully