Can't turn on the wireless option. Greyed out.

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I have an old laptop [HP Elitebook 8470p], with the OS being MS Windows 7 Ultimate. The wifi symbol has a red cross on it. Hence I am unable to connect to any network. So I looked online for the solutions, and I opened the Windows Mobility Center and there I found that the wireless option was greyed out [Please refer to the attached image], hence I could not turn it on. I tried doing the fn + function keys, but no luck. There is no function key for the wireless option on the keyboard. Please help and provide a step by step solution.

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