A new CD installed

I just installed a new CD in my desktop but are unable to get it working! It shows in "device manager - disc drives" but not in "computer". Anybody can help me to activate this device?
Thanks on forehand!

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Clarification Request
(NT) What operating system and version?
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"show in device manager"

with or without exclamation point? If it is WITH..then there is a problem. Return it and get another.

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So Windows? In Device Manager, no drive letter?

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