I key works as eject CD key

I use Dell 1555 laptop with Win7 64-bit OS since 2 years. Whenever I press the 'I' key it asserts the DVD drive (drive sounds like ejecting a CD/DVD). After this and some delay the 'I'/'i' is displayed as expected. It is very annoying to hear the sound. Please suggest a solution to make 'I' key proper.

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